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100 results found for "reciprocal of surd" in Class 10.

कौन-सा विकल्प \(\sqrt{2}+\sqrt{3}\) के व्युत्क्रम को सही बताता है?

Which option correctly gives the reciprocal of \(\sqrt{2}+\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}-\sqrt{2}\)

Step 1

Concept

(\(\sqrt{2}+\sqrt{3}\)\(\sqrt{3}-\sqrt{2}\)=3-2=1).

Step 2

Why this answer is correct

Therefore \(\sqrt{3}-\sqrt{2}\) is its reciprocal.

Step 3

Exam Tip

In reciprocals, keep the order and sign of the conjugate carefully. चरण 1: (\(\sqrt{2}+\sqrt{3}\)\(\sqrt{3}-\sqrt{2}\)=3-2=1)। चरण 2: इसलिए \(\sqrt{3}-\sqrt{2}\) इसका व्युत्क्रम है। चरण 3: व्युत्क्रम में संयुग्मी का क्रम और चिह्न सावधानी से रखें।

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कौन-सा विकल्प \(2\sqrt{3}+3\sqrt{2}\) को एक वर्गमूल के वर्ग के रूप में पहचानने में मदद करता है?

Which option helps identify \(2\sqrt{3}+3\sqrt{2}\) as a square of a surd expression?

Explanation opens after your attempt
Correct Answer

A. (\(\sqrt{3}+\sqrt{2}\)2-5)

Step 1

Concept

(\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}), which does not match the given expression.

Step 2

Why this answer is correct

The expression \(2\sqrt{3}+3\sqrt{2}\) does not directly match any listed square form.

Step 3

Exam Tip

Always expand and match, not guess by appearance. चरण 1: (\(\sqrt{3}+\sqrt{2}\)2=3+2+2\sqrt{6}=5+2\sqrt{6}) होता है, यह दिए गए पद जैसा नहीं है। चरण 2: दिए गए \(2\sqrt{3}+3\sqrt{2}\) को सीधे इस रूप में मिलाना संभव नहीं है; इसलिए यह विकल्पों में कोई सीधा वर्ग नहीं बनाता। चरण 3: ऐसे प्रश्न में पहले प्रसार करके मिलान करें, अनुमान से नहीं।

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एक संख्या और उसके व्युत्क्रम का योग \(\frac{17}{4}\) है। बड़ी संख्या क्या है?

The sum of a number and its reciprocal is \(\frac{17}{4}\). What is the larger value of the number?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

From \(x+\frac{1}{x}=\frac{17}{4}\), we get \(4x^2-17x+4=0\). The roots are (4) and \(\frac{1}{4}\), so the larger value is (4).

Step 2

Why this answer is correct

The correct answer is C. (4). From \(x+\frac{1}{x}=\frac{17}{4}\), we get \(4x^2-17x+4=0\). The roots are (4) and \(\frac{1}{4}\), so the larger value is (4).

Step 3

Exam Tip

\(x+\frac{1}{x}=\frac{17}{4}\) से \(4x^2-17x+4=0\) बनता है। हल (4) और \(\frac{1}{4}\) हैं इसलिए बड़ी संख्या (4) है।

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एक संख्या अपने व्युत्क्रम से \(\frac{15}{4}\) अधिक है। धनात्मक संख्या क्या है?

A number exceeds its reciprocal by \(\frac{15}{4}\). What is the positive number?

Explanation opens after your attempt
Correct Answer

B. (4)

Step 1

Concept

The equation is \(x-\frac{1}{x}=\frac{15}{4}\). This gives \(4x^2-15x-4=0\), so the positive root is (x=4).

Step 2

Why this answer is correct

The correct answer is B. (4). The equation is \(x-\frac{1}{x}=\frac{15}{4}\). This gives \(4x^2-15x-4=0\), so the positive root is (x=4).

Step 3

Exam Tip

समीकरण \(x-\frac{1}{x}=\frac{15}{4}\) है। इससे \(4x^2-15x-4=0\) और धनात्मक हल (x=4) है।

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एक धनात्मक संख्या और उसके व्युत्क्रम का अंतर \(\frac{3}{2}\) है। संख्या क्या है?

The difference between a positive number and its reciprocal is \(\frac{3}{2}\). What is the number?

Explanation opens after your attempt
Correct Answer

C. (2)

Step 1

Concept

The equation is \(x-\frac{1}{x}=\frac{3}{2}\). It gives \(2x^2-3x-2=0\) and (x=2).

Step 2

Why this answer is correct

The correct answer is C. (2). The equation is \(x-\frac{1}{x}=\frac{3}{2}\). It gives \(2x^2-3x-2=0\) and (x=2).

Step 3

Exam Tip

समीकरण \(x-\frac{1}{x}=\frac{3}{2}\) है। इससे \(2x^2-3x-2=0\) और (x=2) मिलता है।

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एक धनात्मक संख्या और उसके व्युत्क्रम का योग \(\frac{5}{2}\) है। वह संख्या क्या हो सकती है?

The sum of a positive number and its reciprocal is \(\frac{5}{2}\). What can the number be?

Explanation opens after your attempt
Correct Answer

C. (2) या \(\frac{1}{2}\)(2) or \(\frac{1}{2}\)

Step 1

Concept

The equation \(x+\frac{1}{x}=\frac{5}{2}\) gives \(2x^2-5x+2=0\). The solutions are (x=2) or \(x=\frac{1}{2}\).

Step 2

Why this answer is correct

The correct answer is C. (2) या \(\frac{1}{2}\) / (2) or \(\frac{1}{2}\). The equation \(x+\frac{1}{x}=\frac{5}{2}\) gives \(2x^2-5x+2=0\). The solutions are (x=2) or \(x=\frac{1}{2}\).

Step 3

Exam Tip

समीकरण \(x+\frac{1}{x}=\frac{5}{2}\) से \(2x^2-5x+2=0\) बनता है। हल (x=2) या \(x=\frac{1}{2}\) हैं।

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एक संख्या और उसके व्युत्क्रम का योग \(\frac{10}{3}\) है। बड़ी संख्या क्या है?

The sum of a number and its reciprocal is \(\frac{10}{3}\). What is the larger number?

Explanation opens after your attempt
Correct Answer

A. (3)

Step 1

Concept

Let the number be (x), so \(x+\frac{1}{x}=\frac{10}{3}\). This gives \(3x^2-10x+3=0\), so the larger number is (3).

Step 2

Why this answer is correct

The correct answer is A. (3). Let the number be (x), so \(x+\frac{1}{x}=\frac{10}{3}\). This gives \(3x^2-10x+3=0\), so the larger number is (3).

Step 3

Exam Tip

मान लें संख्या (x) है, तो \(x+\frac{1}{x}=\frac{10}{3}\)। इससे \(3x^2-10x+3=0\), इसलिए बड़ी संख्या (3) है।

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एक संख्या और उसके व्युत्क्रम का योग \(\frac{5}{2}\) है। बड़ी संख्या क्या है?

The sum of a number and its reciprocal is \(\frac{5}{2}\). What is the larger number?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

Let the number be (x), so \(x+\frac{1}{x}=\frac{5}{2}\). This gives \(2x^2-5x+2=0\), so the larger number is (2).

Step 2

Why this answer is correct

The correct answer is A. (2). Let the number be (x), so \(x+\frac{1}{x}=\frac{5}{2}\). This gives \(2x^2-5x+2=0\), so the larger number is (2).

Step 3

Exam Tip

मान लें संख्या (x) है, तो \(x+\frac{1}{x}=\frac{5}{2}\)। इससे \(2x^2-5x+2=0\), इसलिए बड़ी संख्या (2) है।

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यदि \(kx^2-12x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हैं, तो (k) पर सही शर्त क्या है?

If \(kx^2-12x+k=0\) has real reciprocal roots, what is the correct condition on (k)?

Explanation opens after your attempt
Correct Answer

A. \(k\neq0\) और \(k^2\le36\)\(k\neq0\) and \(k^2\le36\)

Step 1

Concept

The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(144-4k^2\ge0\), hence \(k^2\le36\).

Step 2

Why this answer is correct

The correct answer is A. \(k\neq0\) और \(k^2\le36\) / \(k\neq0\) and \(k^2\le36\). The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(144-4k^2\ge0\), hence \(k^2\le36\).

Step 3

Exam Tip

जड़ों का गुणनफल \(\frac{k}{k}=1\) है, इसलिए \(k\neq0\) चाहिए। वास्तविक जड़ों के लिए \(144-4k^2\ge0\), अतः \(k^2\le36\)।

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यदि ((m-1)x-2+2(m+1)x+(m-1)=0) की जड़ें वास्तविक और व्युत्क्रम हों, तो (m) पर सही शर्त क्या है?

If ((m-1)x-2+2(m+1)x+(m-1)=0) has real reciprocal roots, what is the correct condition on (m)?

Explanation opens after your attempt
Correct Answer

A. \(m\ge0\) और \(m\neq1\)\(m\ge0\) and \(m\neq1\)

Step 1

Concept

The product of roots is \(\frac{m-1}{m-1}=1\), so \(m\neq1\) is needed. For real roots, \(D=16m\ge0\), hence \(m\ge0\) and \(m\neq1\).

Step 2

Why this answer is correct

The correct answer is A. \(m\ge0\) और \(m\neq1\) / \(m\ge0\) and \(m\neq1\). The product of roots is \(\frac{m-1}{m-1}=1\), so \(m\neq1\) is needed. For real roots, \(D=16m\ge0\), hence \(m\ge0\) and \(m\neq1\).

Step 3

Exam Tip

जड़ों का गुणनफल \(\frac{m-1}{m-1}=1\) है, इसलिए \(m\neq1\) चाहिए। वास्तविक जड़ों के लिए \(D=16m\ge0\), अतः \(m\ge0\) और \(m\neq1\)।

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यदि \(kx^2-10x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हैं, तो (k) पर सही शर्त कौन-सी है?

If \(kx^2-10x+k=0\) has real reciprocal roots, which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

C. \(k\neq0\) और \(k^2\le25\)\(k\neq0\) and \(k^2\le25\)

Step 1

Concept

The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(100-4k^2\ge0\), hence \(k^2\le25\).

Step 2

Why this answer is correct

The correct answer is C. \(k\neq0\) और \(k^2\le25\) / \(k\neq0\) and \(k^2\le25\). The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(100-4k^2\ge0\), hence \(k^2\le25\).

Step 3

Exam Tip

जड़ों का गुणनफल \(\frac{k}{k}=1\) है, इसलिए \(k\neq0\) चाहिए। वास्तविक जड़ों के लिए \(100-4k^2\ge0\), अतः \(k^2\le25\)।

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यदि \(kx^2-8x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हैं, तो (k) पर सही शर्त क्या है?

If the roots of \(kx^2-8x+k=0\) are real and reciprocal, what is the correct condition on (k)?

Explanation opens after your attempt
Correct Answer

A. \(k\neq0\) और \(k^2\le16\)\(k\neq0\) and \(k^2\le16\)

Step 1

Concept

For reciprocal roots, \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(64-4k^2\ge0\), hence \(k^2\le16\).

Step 2

Why this answer is correct

The correct answer is A. \(k\neq0\) और \(k^2\le16\) / \(k\neq0\) and \(k^2\le16\). For reciprocal roots, \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(64-4k^2\ge0\), hence \(k^2\le16\).

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए \(\frac{k}{k}=1\) है, इसलिए \(k\neq0\) चाहिए। वास्तविक जड़ों के लिए \(64-4k^2\ge0\), अतः \(k^2\le16\)।

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\(x^2-4x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हों, तो (k) का मान क्या है?

If the roots of \(x^2-4x+k=0\) are real and reciprocal, what is (k)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=k\), so (k=1), and (D=12>0) confirms real roots.

Step 2

Why this answer is correct

The correct answer is A. (1). For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=k\), so (k=1), and (D=12>0) confirms real roots.

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए \(\alpha\beta=1\) होता है। यहाँ \(\alpha\beta=k\), इसलिए (k=1), और (D=12>0) से जड़ें वास्तविक भी हैं।

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यदि \(x^2+mx+64=0\) का एक मूल दूसरे का व्युत्क्रम है, तो (m) के बारे में क्या कहा जा सकता है?

If one root of \(x^2+mx+64=0\) is the reciprocal of the other, what can be said about (m)?

Explanation opens after your attempt
Correct Answer

A. ऐसा संभव नहीं हैIt is not possible

Step 1

Concept

If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (64), so it is not possible.

Step 2

Why this answer is correct

The correct answer is A. ऐसा संभव नहीं है / It is not possible. If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (64), so it is not possible.

Step 3

Exam Tip

एक मूल दूसरे का व्युत्क्रम हो तो मूलों का गुणनफल (1) होना चाहिए। यहाँ गुणनफल (64) है, इसलिए ऐसा संभव नहीं है।

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यदि \(x^2+mx+49=0\) का एक मूल दूसरे का व्युत्क्रम है, तो (m) के बारे में क्या कहा जा सकता है?

If one root of \(x^2+mx+49=0\) is the reciprocal of the other, what can be said about (m)?

Explanation opens after your attempt
Correct Answer

A. ऐसा संभव नहीं हैIt is not possible

Step 1

Concept

If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (49), so it is not possible.

Step 2

Why this answer is correct

The correct answer is A. ऐसा संभव नहीं है / It is not possible. If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (49), so it is not possible.

Step 3

Exam Tip

एक मूल दूसरे का व्युत्क्रम हो तो मूलों का गुणनफल (1) होना चाहिए। यहाँ गुणनफल (49) है, इसलिए ऐसा संभव नहीं है।

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यदि \(x^2+mx+36=0\) का एक मूल दूसरे का व्युत्क्रम है, तो (m) के बारे में क्या कहा जा सकता है?

If one root of \(x^2+mx+36=0\) is the reciprocal of the other, what can be said about (m)?

Explanation opens after your attempt
Correct Answer

A. ऐसा संभव नहीं हैIt is not possible

Step 1

Concept

If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (36), so it is not possible.

Step 2

Why this answer is correct

The correct answer is A. ऐसा संभव नहीं है / It is not possible. If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (36), so it is not possible.

Step 3

Exam Tip

एक मूल दूसरे का व्युत्क्रम हो तो मूलों का गुणनफल (1) होना चाहिए। यहाँ गुणनफल (36) है, इसलिए ऐसा संभव नहीं है।

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यदि \(x^2+mx+25=0\) का एक मूल दूसरे का व्युत्क्रम है, तो (m) के बारे में क्या कहा जा सकता है?

If one root of \(x^2+mx+25=0\) is the reciprocal of the other, what can be said about (m)?

Explanation opens after your attempt
Correct Answer

A. ऐसा संभव नहीं हैIt is not possible

Step 1

Concept

If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (25), so it is not possible.

Step 2

Why this answer is correct

The correct answer is A. ऐसा संभव नहीं है / It is not possible. If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (25), so it is not possible.

Step 3

Exam Tip

एक मूल दूसरे का व्युत्क्रम हो तो मूलों का गुणनफल (1) होना चाहिए। यहाँ गुणनफल (25) है, इसलिए ऐसा संभव नहीं है।

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यदि \(x^2+mx+16=0\) का एक मूल दूसरे का व्युत्क्रम है, तो (m) के बारे में क्या कहा जा सकता है?

If one root of \(x^2+mx+16=0\) is the reciprocal of the other, what can be said about (m)?

Explanation opens after your attempt
Correct Answer

A. ऐसा संभव नहीं हैIt is not possible

Step 1

Concept

If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (16), so it is not possible.

Step 2

Why this answer is correct

The correct answer is A. ऐसा संभव नहीं है / It is not possible. If one root is the reciprocal of the other, the product of roots must be (1). Here the product is (16), so it is not possible.

Step 3

Exam Tip

एक मूल दूसरे का व्युत्क्रम हो तो मूलों का गुणनफल (1) होना चाहिए। यहाँ गुणनफल (16) है, इसलिए ऐसा संभव नहीं है।

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किस विकल्प में संख्या अपरिमेय है, लेकिन उसका व्युत्क्रम भी अपरिमेय है?

In which option is the number irrational and its reciprocal also irrational?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{12}\)

Step 1

Concept

\(\sqrt{12}=2\sqrt{3}\) is irrational.

Step 2

Why this answer is correct

Its reciprocal \(\frac{1}{2\sqrt{3}}=\frac{\sqrt{3}}{6}\) is also irrational.

Step 3

Exam Tip

Do not assume the reciprocal of a non-zero irrational surd is rational. चरण 1: \(\sqrt{12}=2\sqrt{3}\) अपरिमेय है। चरण 2: इसका व्युत्क्रम \(\frac{1}{2\sqrt{3}}=\frac{\sqrt{3}}{6}\) भी अपरिमेय है। चरण 3: अशून्य अपरिमेय मूल के व्युत्क्रम को परिमेय मानने की गलती न करें।

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यदि \(x=3+\sqrt{10}\), तो \(x+\frac{1}{x}\) का मान क्या है?

If \(x=3+\sqrt{10}\), what is the value of \(x+\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{10}\)

Step 1

Concept

\(\frac{1}{3+\sqrt{10}}=\sqrt{10}-3\), so the sum is \(2\sqrt{10}\). In exams rationalize the reciprocal first.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{10}\). \(\frac{1}{3+\sqrt{10}}=\sqrt{10}-3\), so the sum is \(2\sqrt{10}\). In exams rationalize the reciprocal first.

Step 3

Exam Tip

\(\frac{1}{3+\sqrt{10}}=\sqrt{10}-3\), इसलिए योग \(2\sqrt{10}\) है। परीक्षा में पहले व्युत्क्रम को परिमेयकृत करें।

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यदि \(x=\sqrt{5}-2\), तो \(x+\frac{1}{x}\) का मान क्या है?

If \(x=\sqrt{5}-2\), what is the value of \(x+\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{5}\)

Step 1

Concept

\(\frac{1}{\sqrt{5}-2}=\sqrt{5}+2\), because (\(\sqrt{5}-2\)\(\sqrt{5}+2\)=1).

Step 2

Why this answer is correct

Hence (x+\frac{1}{x}=\(\sqrt{5}-2\)+\(\sqrt{5}+2\)=2\sqrt{5}).

Step 3

Exam Tip

When conjugates multiply to (1), the reciprocal is immediate. चरण 1: \(\frac{1}{\sqrt{5}-2}=\sqrt{5}+2\), क्योंकि (\(\sqrt{5}-2\)\(\sqrt{5}+2\)=1)। चरण 2: इसलिए (x+\frac{1}{x}=\(\sqrt{5}-2\)+\(\sqrt{5}+2\)=2\sqrt{5})। चरण 3: जहाँ संयुग्मी गुणन (1) दे, वहाँ व्युत्क्रम तुरंत मिल जाता है।

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यदि \(x=\sqrt{3}+\sqrt{2}\), तो \(\frac{1}{x}\) का परिमेय हर वाला रूप कौन-सा है?

If \(x=\sqrt{3}+\sqrt{2}\), which is the rationalized form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}-\sqrt{2}\)

Step 1

Concept

The conjugate of \(\sqrt{3}+\sqrt{2}\) is \(\sqrt{3}-\sqrt{2}\).

Step 2

Why this answer is correct

The denominator becomes (3-2=1), so \(\frac{1}{\sqrt{3}+\sqrt{2}}=\sqrt{3}-\sqrt{2}\).

Step 3

Exam Tip

When the difference of the squared surds is (1), the result becomes very simple. चरण 1: \(\sqrt{3}+\sqrt{2}\) का संयुग्मी \(\sqrt{3}-\sqrt{2}\) है। चरण 2: हर (3-2=1) बनता है, इसलिए \(\frac{1}{\sqrt{3}+\sqrt{2}}=\sqrt{3}-\sqrt{2}\)। चरण 3: जिन दो मूलों के वर्गों का अंतर (1) हो, वहाँ उत्तर बहुत सरल आता है।

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एक भिन्न का हर अंश से (3) अधिक है। यदि भिन्न और उसके व्युत्क्रम का योग \(\frac{29}{10}\) है तो अंश क्या है?

The denominator of a fraction is (3) more than its numerator. If the sum of the fraction and its reciprocal is \(\frac{29}{10}\), what is the numerator?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

The fraction is \(\frac{x}{x+3}\). From \(\frac{x}{x+3}+\frac{x+3}{x}=\frac{29}{10}\), (x=2) or (x=15), and among the options (2) is correct.

Step 2

Why this answer is correct

The correct answer is A. (2). The fraction is \(\frac{x}{x+3}\). From \(\frac{x}{x+3}+\frac{x+3}{x}=\frac{29}{10}\), (x=2) or (x=15), and among the options (2) is correct.

Step 3

Exam Tip

भिन्न \(\frac{x}{x+3}\) है। \(\frac{x}{x+3}+\frac{x+3}{x}=\frac{29}{10}\) से (x=2) या (x=15) आता है और विकल्पों में (2) सही है।

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एक धनात्मक भिन्न का हर अंश से (4) अधिक है। भिन्न और उसके व्युत्क्रम का योग \(\frac{41}{20}\) है। भिन्न क्या है?

In a positive fraction, the denominator is (4) more than the numerator. The sum of the fraction and its reciprocal is \(\frac{41}{20}\). What is the fraction?

Explanation opens after your attempt
Correct Answer

B. \(\frac{5}{9}\)

Step 1

Concept

Let the fraction be \(\frac{x}{x+4}\), then \(\frac{x}{x+4}+\frac{x+4}{x}=\frac{41}{20}\). This gives (x=5), so the fraction is \(\frac{5}{9}\).

Step 2

Why this answer is correct

The correct answer is B. \(\frac{5}{9}\). Let the fraction be \(\frac{x}{x+4}\), then \(\frac{x}{x+4}+\frac{x+4}{x}=\frac{41}{20}\). This gives (x=5), so the fraction is \(\frac{5}{9}\).

Step 3

Exam Tip

भिन्न \(\frac{x}{x+4}\) हो, तो \(\frac{x}{x+4}+\frac{x+4}{x}=\frac{41}{20}\)। इससे (x=5), इसलिए भिन्न \(\frac{5}{9}\) है।

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संख्या रेखा पर \(\sqrt{50}\) को सरल कर अनुमान लगाने पर वह किसके निकट है?

After simplifying and estimating \(\sqrt{50}\) on the number line, it is near which value?

Explanation opens after your attempt
Correct Answer

A. (7.07)

Step 1

Concept

\(\sqrt{50}=5\sqrt{2}\approx5\times1.414=7.07\). First take out the largest perfect-square factor.

Step 2

Why this answer is correct

The correct answer is A. (7.07). \(\sqrt{50}=5\sqrt{2}\approx5\times1.414=7.07\). First take out the largest perfect-square factor.

Step 3

Exam Tip

\(\sqrt{50}=5\sqrt{2}\approx5\times1.414=7.07\)। पहले बड़ा पूर्ण वर्ग बाहर निकालें।

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संख्या रेखा पर \(\sqrt{2}\) और \(\sqrt{8}\) के मध्य बिंदु का मान क्या होगा?

What is the midpoint of \(\sqrt{2}\) and \(\sqrt{8}\) on the number line?

Explanation opens after your attempt
Correct Answer

A. \(\frac{3\sqrt{2}}{2}\)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\), so the midpoint is \(\frac{\sqrt{2}+2\sqrt{2}}{2}=\frac{3\sqrt{2}}{2}\). Simplify first, then average.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{3\sqrt{2}}{2}\). \(\sqrt{8}=2\sqrt{2}\), so the midpoint is \(\frac{\sqrt{2}+2\sqrt{2}}{2}=\frac{3\sqrt{2}}{2}\). Simplify first, then average.

Step 3

Exam Tip

\(\sqrt{8}=2\sqrt{2}\), इसलिए मध्य बिंदु \(\frac{\sqrt{2}+2\sqrt{2}}{2}=\frac{3\sqrt{2}}{2}\) है। सरलीकरण के बाद औसत लें।

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किस विकल्प में संख्या रेखा पर \(-\sqrt{12}\) का सही सरल अंतराल है?

Which option gives the correct simple interval for \(-\sqrt{12}\) on the number line?

Explanation opens after your attempt
Correct Answer

A. ((-4,-3))

Step 1

Concept

Since \(3<\sqrt{12}<4\), \(-4<-\sqrt{12}<-3\). Multiplying by a negative reverses the inequality.

Step 2

Why this answer is correct

The correct answer is A. ((-4,-3)). Since \(3<\sqrt{12}<4\), \(-4<-\sqrt{12}<-3\). Multiplying by a negative reverses the inequality.

Step 3

Exam Tip

क्योंकि \(3<\sqrt{12}<4\), इसलिए \(-4<-\sqrt{12}<-3\)। ऋणात्मक करने पर असमानता की दिशा बदलती है।

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संख्या रेखा पर \(\sqrt{2}+\sqrt{3}\) किस अंतराल में होगा?

On the number line, in which interval will \(\sqrt{2}+\sqrt{3}\) lie?

Explanation opens after your attempt
Correct Answer

A. ((3,4))

Step 1

Concept

\(\sqrt{2}\approx1.414\) and \(\sqrt{3}\approx1.732\), so the sum is about (3.146). Add approximate values for sums.

Step 2

Why this answer is correct

The correct answer is A. ((3,4)). \(\sqrt{2}\approx1.414\) and \(\sqrt{3}\approx1.732\), so the sum is about (3.146). Add approximate values for sums.

Step 3

Exam Tip

\(\sqrt{2}\approx1.414\) और \(\sqrt{3}\approx1.732\), इसलिए योग लगभग (3.146) है। योग के लिए अनुमानित मान जोड़ें।

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यदि (A) संख्या रेखा पर \(\sqrt{18}\) है, तो (A) किसके सबसे निकट होगा?

If (A) is \(\sqrt{18}\) on the number line, to which number is (A) closest?

Explanation opens after your attempt
Correct Answer

A. (4.24)

Step 1

Concept

\(\sqrt{18}=3\sqrt{2}\approx4.242\), so (4.24) is closest. Simplification makes estimation easier.

Step 2

Why this answer is correct

The correct answer is A. (4.24). \(\sqrt{18}=3\sqrt{2}\approx4.242\), so (4.24) is closest. Simplification makes estimation easier.

Step 3

Exam Tip

\(\sqrt{18}=3\sqrt{2}\approx4.242\), इसलिए (4.24) सबसे निकट है। सरलीकरण अनुमान को आसान बनाता है।

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यदि \(x=\sqrt{12}\), तो संख्या रेखा पर (x) के लिए सही सरलीकृत रूप कौन-सा है?

If \(x=\sqrt{12}\), which simplified form is correct for placing (x) on the number line?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{3}\)

Step 1

Concept

\(\sqrt{12}=\sqrt{4\cdot3}=2\sqrt{3}\). Simplify the square root before estimating its position.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{3}\). \(\sqrt{12}=\sqrt{4\cdot3}=2\sqrt{3}\). Simplify the square root before estimating its position.

Step 3

Exam Tip

\(\sqrt{12}=\sqrt{4\cdot3}=2\sqrt{3}\)। स्थान अनुमान से पहले वर्गमूल को सरल करें।

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संख्या रेखा पर \(a=\sqrt{12}\) और (b=3.5) में कौन दाईं ओर होगा?

On the number line, which one will be to the right, \(a=\sqrt{12}\) or (b=3.5)?

Explanation opens after your attempt
Correct Answer

B. (b)

Step 1

Concept

\(\sqrt{12}\) is about (3.46), and (3.5) is greater. In exams, the greater number lies to the right.

Step 2

Why this answer is correct

The correct answer is B. (b). \(\sqrt{12}\) is about (3.46), and (3.5) is greater. In exams, the greater number lies to the right.

Step 3

Exam Tip

\(\sqrt{12}\) लगभग (3.46) है और (3.5) उससे बड़ा है। परीक्षा में दाईं ओर बड़ी संख्या होती है।

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संख्या रेखा पर \(3\sqrt{2}\) किस दो पूर्णांकों के बीच होगा?

Between which two integers will \(3\sqrt{2}\) lie on the number line?

Explanation opens after your attempt
Correct Answer

B. (4) और (5)(4) and (5)

Step 1

Concept

\(3\sqrt{2}\) is about (4.24), so it lies between (4) and (5). In exams, you may estimate \(\sqrt{2}\) as about (1.414).

Step 2

Why this answer is correct

The correct answer is B. (4) और (5) / (4) and (5). \(3\sqrt{2}\) is about (4.24), so it lies between (4) and (5). In exams, you may estimate \(\sqrt{2}\) as about (1.414).

Step 3

Exam Tip

\(3\sqrt{2}\) लगभग (4.24) है, इसलिए यह (4) और (5) के बीच है। परीक्षा में \(\sqrt{2}\) को लगभग (1.414) मानकर अनुमान लगा सकते हैं।

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संख्या रेखा पर \(\sqrt{50}\) के लिए सबसे अच्छा सरल रूप कौन सा है?

Which is the best simplified form for \(\sqrt{50}\) on the number line?

Explanation opens after your attempt
Correct Answer

A. \(5\sqrt{2}\)

Step 1

Concept

\(\sqrt{50}=\sqrt{25\cdot2}=5\sqrt{2}\). In exams, take out square factors to simplify roots.

Step 2

Why this answer is correct

The correct answer is A. \(5\sqrt{2}\). \(\sqrt{50}=\sqrt{25\cdot2}=5\sqrt{2}\). In exams, take out square factors to simplify roots.

Step 3

Exam Tip

\(\sqrt{50}=\sqrt{25\cdot2}=5\sqrt{2}\) है। परीक्षा में वर्ग गुणनखंड निकालकर वर्गमूल सरल करें।

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यदि किसी द्विघात बहुपद के शून्यक \(2+\sqrt{3}\) और \(2-\sqrt{3}\) हैं, तो मोनिक बहुपद कौन-सा है?

If the zeroes of a quadratic polynomial are \(2+\sqrt{3}\) and \(2-\sqrt{3}\), which is the monic polynomial?

Explanation opens after your attempt
Correct Answer

A. \(x^2-4x+1\)

Step 1

Concept

The sum is (4) and the product is (1). Therefore the monic polynomial is \(x^2-4x+1\).

Step 2

Why this answer is correct

The correct answer is A. \(x^2-4x+1\). The sum is (4) and the product is (1). Therefore the monic polynomial is \(x^2-4x+1\).

Step 3

Exam Tip

योग (4) और गुणनफल (1) है। अतः मोनिक बहुपद \(x^2-4x+1\) होगा।

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समीकरण (x-2-2\(3+\sqrt{5}\)x+\(14+6\sqrt{5}\)=0) के मूलों की प्रकृति क्या होगी?

What will be the nature of roots of (x-2-2\(3+\sqrt{5}\)x+\(14+6\sqrt{5}\)=0)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समानTwo real and equal

Step 1

Concept

Here (D=4\(3+\sqrt{5}\)2-4\(14+6\sqrt{5}\)=0). Hence the roots are equal.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान / Two real and equal. Here (D=4\(3+\sqrt{5}\)2-4\(14+6\sqrt{5}\)=0). Hence the roots are equal.

Step 3

Exam Tip

यहाँ (D=4\(3+\sqrt{5}\)2-4\(14+6\sqrt{5}\)=0) है। अतः मूल समान हैं।

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समीकरण (x-2+2\(3-\sqrt{10}\)x+16=0) के मूलों की प्रकृति क्या है?

What is the nature of roots of (x-2+2\(3-\sqrt{10}\)x+16=0)?

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहींNo real roots

Step 1

Concept

Here (D=4\(3-\sqrt{10}\)2-64), which is negative. So there are no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं / No real roots. Here (D=4\(3-\sqrt{10}\)2-64), which is negative. So there are no real roots.

Step 3

Exam Tip

यहाँ (D=4\(3-\sqrt{10}\)2-64) है जो ऋणात्मक है। इसलिए वास्तविक मूल नहीं हैं।

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समीकरण \(5x^2-3\sqrt{5}x+6=0\) के मूलों के बारे में सही विकल्प कौन सा है?

Which option is correct about the roots of \(5x^2-3\sqrt{5}x+6=0\)?

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहीं ((D=-75))No real roots ((D=-75))

Step 1

Concept

Here (D=\(-3\sqrt{5}\)2-4(5)(6)=45-120=-75). Because (D) is negative, there are no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं ((D=-75)) / No real roots ((D=-75)). Here (D=\(-3\sqrt{5}\)2-4(5)(6)=45-120=-75). Because (D) is negative, there are no real roots.

Step 3

Exam Tip

यहाँ (D=\(-3\sqrt{5}\)2-4(5)(6)=45-120=-75) है। ऋणात्मक (D) के कारण वास्तविक मूल नहीं हैं।

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समीकरण \(8x^2-4\sqrt{10}x+5=0\) में मूलों की प्रकृति क्या है?

What is the nature of roots in \(8x^2-4\sqrt{10}x+5=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-4\sqrt{10}\)2-4(8)(5)=160-160=0). (D=0) gives equal roots.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-4\sqrt{10}\)2-4(8)(5)=160-160=0). (D=0) gives equal roots.

Step 3

Exam Tip

यहाँ (D=\(-4\sqrt{10}\)2-4(8)(5)=160-160=0) है। (D=0) से समान मूल मिलते हैं।

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समीकरण \(3x^2-2\sqrt{21}x+7=0\) के मूलों की प्रकृति क्या होगी?

What will be the nature of roots of \(3x^2-2\sqrt{21}x+7=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-2\sqrt{21}\)2-4(3)(7)=84-84=0). Therefore both roots are equal.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-2\sqrt{21}\)2-4(3)(7)=84-84=0). Therefore both roots are equal.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{21}\)2-4(3)(7)=84-84=0) है। इसलिए दोनों मूल समान हैं।

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समीकरण \(2x^2-5\sqrt{2}x+8=0\) के लिए सही निष्कर्ष चुनिए।

Choose the correct conclusion for \(2x^2-5\sqrt{2}x+8=0\).

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहीं ((D=-14))No real roots ((D=-14))

Step 1

Concept

Here (D=\(-5\sqrt{2}\)2-4(2)(8)=50-64=-14). For negative (D), real roots do not exist.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं ((D=-14)) / No real roots ((D=-14)). Here (D=\(-5\sqrt{2}\)2-4(2)(8)=50-64=-14). For negative (D), real roots do not exist.

Step 3

Exam Tip

यहाँ (D=\(-5\sqrt{2}\)2-4(2)(8)=50-64=-14) है। ऋणात्मक (D) पर वास्तविक मूल नहीं होते।

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समीकरण \(6x^2-4\sqrt{6}x+4=0\) के मूलों की प्रकृति क्या है?

What is the nature of roots of \(6x^2-4\sqrt{6}x+4=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-4\sqrt{6}\)2-4(6)(4)=96-96=0). (D=0) indicates equal roots.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-4\sqrt{6}\)2-4(6)(4)=96-96=0). (D=0) indicates equal roots.

Step 3

Exam Tip

यहाँ (D=\(-4\sqrt{6}\)2-4(6)(4)=96-96=0) है। (D=0) समान मूलों का संकेत है।

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समीकरण (x-2-2\(1+\sqrt{5}\)x+\(6+2\sqrt{5}\)=0) के मूलों की प्रकृति क्या है?

What is the nature of roots of (x-2-2\(1+\sqrt{5}\)x+\(6+2\sqrt{5}\)=0)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=4\(1+\sqrt{5}\)2-4\(6+2\sqrt{5}\)=0). Therefore both roots are equal real roots.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=4\(1+\sqrt{5}\)2-4\(6+2\sqrt{5}\)=0). Therefore both roots are equal real roots.

Step 3

Exam Tip

यहाँ (D=4\(1+\sqrt{5}\)2-4\(6+2\sqrt{5}\)=0) है। इसलिए दोनों मूल समान वास्तविक हैं।

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समीकरण (x-2-2\(2+\sqrt{3}\)x+\(7+4\sqrt{3}\)=0) के मूलों की प्रकृति क्या होगी?

What will be the nature of roots of (x-2-2\(2+\sqrt{3}\)x+\(7+4\sqrt{3}\)=0)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समानTwo real and equal

Step 1

Concept

Here (D=4\(2+\sqrt{3}\)2-4\(7+4\sqrt{3}\)=0). Hence the roots are equal.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान / Two real and equal. Here (D=4\(2+\sqrt{3}\)2-4\(7+4\sqrt{3}\)=0). Hence the roots are equal.

Step 3

Exam Tip

यहाँ (D=4\(2+\sqrt{3}\)2-4\(7+4\sqrt{3}\)=0) है। अतः मूल समान हैं।

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समीकरण (x-2+2\(2-\sqrt{5}\)x+9=0) के मूलों की प्रकृति क्या है?

What is the nature of roots of (x-2+2\(2-\sqrt{5}\)x+9=0)?

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहींNo real roots

Step 1

Concept

Here (D=4\(2-\sqrt{5}\)2-36), which is negative. So there are no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं / No real roots. Here (D=4\(2-\sqrt{5}\)2-36), which is negative. So there are no real roots.

Step 3

Exam Tip

यहाँ (D=4\(2-\sqrt{5}\)2-36) है जो ऋणात्मक है। इसलिए वास्तविक मूल नहीं हैं।

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समीकरण \(2x^2-3\sqrt{2}x+7=0\) के मूलों के बारे में सही विकल्प कौन सा है?

Which option is correct about the roots of \(2x^2-3\sqrt{2}x+7=0\)?

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहीं ((D=-38))No real roots ((D=-38))

Step 1

Concept

Here (D=\(-3\sqrt{2}\)2-4(2)(7)=18-56=-38). Because (D) is negative, there are no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं ((D=-38)) / No real roots ((D=-38)). Here (D=\(-3\sqrt{2}\)2-4(2)(7)=18-56=-38). Because (D) is negative, there are no real roots.

Step 3

Exam Tip

यहाँ (D=\(-3\sqrt{2}\)2-4(2)(7)=18-56=-38) है। ऋणात्मक (D) के कारण वास्तविक मूल नहीं हैं।

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समीकरण \(7x^2-2\sqrt{21}x+3=0\) में मूलों की प्रकृति क्या है?

What is the nature of roots in \(7x^2-2\sqrt{21}x+3=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-2\sqrt{21}\)2-4(7)(3)=84-84=0). (D=0) gives equal roots.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-2\sqrt{21}\)2-4(7)(3)=84-84=0). (D=0) gives equal roots.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{21}\)2-4(7)(3)=84-84=0) है। (D=0) से समान मूल मिलते हैं।

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समीकरण \(5x^2-2\sqrt{30}x+6=0\) में मूलों की प्रकृति क्या होगी?

What will be the nature of roots in \(5x^2-2\sqrt{30}x+6=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-2\sqrt{30}\)2-4(5)(6)=120-120=0). (D=0) indicates equal roots.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-2\sqrt{30}\)2-4(5)(6)=120-120=0). (D=0) indicates equal roots.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{30}\)2-4(5)(6)=120-120=0) है। (D=0) समान मूलों का संकेत है।

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समीकरण \(3x^2-4\sqrt{3}x+5=0\) के लिए सही निष्कर्ष चुनिए।

Choose the correct conclusion for \(3x^2-4\sqrt{3}x+5=0\).

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहीं ((D=-12))No real roots ((D=-12))

Step 1

Concept

Here (D=\(-4\sqrt{3}\)2-4(3)(5)=48-60=-12). When (D<0), real roots do not exist.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं ((D=-12)) / No real roots ((D=-12)). Here (D=\(-4\sqrt{3}\)2-4(3)(5)=48-60=-12). When (D<0), real roots do not exist.

Step 3

Exam Tip

यहाँ (D=\(-4\sqrt{3}\)2-4(3)(5)=48-60=-12) है। (D<0) होने पर वास्तविक मूल नहीं होते।

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समीकरण \(2x^2-6\sqrt{2}x+9=0\) के मूलों की प्रकृति क्या है?

What is the nature of roots of \(2x^2-6\sqrt{2}x+9=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-6\sqrt{2}\)2-4(2)(9)=72-72=0). Therefore both roots are equal.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-6\sqrt{2}\)2-4(2)(9)=72-72=0). Therefore both roots are equal.

Step 3

Exam Tip

यहाँ (D=\(-6\sqrt{2}\)2-4(2)(9)=72-72=0) है। इसलिए दोनों मूल समान हैं।

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समीकरण (x-2-2\(3+\sqrt{2}\)x+\(17+12\sqrt{2}\)=0) के मूलों की प्रकृति क्या होगी?

What will be the nature of roots of (x-2-2\(3+\sqrt{2}\)x+\(17+12\sqrt{2}\)=0)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समानTwo real and equal

Step 1

Concept

Here (D=4\(3+\sqrt{2}\)2-4\(17+12\sqrt{2}\)=0). (D=0) shows equal roots.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान / Two real and equal. Here (D=4\(3+\sqrt{2}\)2-4\(17+12\sqrt{2}\)=0). (D=0) shows equal roots.

Step 3

Exam Tip

यहाँ (D=4\(3+\sqrt{2}\)2-4\(17+12\sqrt{2}\)=0) है। (D=0) समान मूलों को दिखाता है।

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समीकरण (x-2+2\(1-\sqrt{3}\)x+4=0) के मूलों की प्रकृति क्या है?

What is the nature of roots of (x-2+2\(1-\sqrt{3}\)x+4=0)?

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहींNo real roots

Step 1

Concept

Here (D=4\(1-\sqrt{3}\)2-16=4\(4-2\sqrt{3}\)-16=-8\sqrt{3}<0). So there are no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं / No real roots. Here (D=4\(1-\sqrt{3}\)2-16=4\(4-2\sqrt{3}\)-16=-8\sqrt{3}<0). So there are no real roots.

Step 3

Exam Tip

यहाँ (D=4\(1-\sqrt{3}\)2-16=4\(4-2\sqrt{3}\)-16=-8\sqrt{3}<0) है। इसलिए वास्तविक मूल नहीं हैं।

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समीकरण \(2x^2-5\sqrt{2}x+12=0\) के लिए सही मूल प्रकृति कौन सी है?

Which root nature is correct for \(2x^2-5\sqrt{2}x+12=0\)?

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहीं ((D=-46))No real roots ((D=-46))

Step 1

Concept

Here (D=\(-5\sqrt{2}\)2-4(2)(12)=50-96=-46). A negative discriminant means no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं ((D=-46)) / No real roots ((D=-46)). Here (D=\(-5\sqrt{2}\)2-4(2)(12)=50-96=-46). A negative discriminant means no real roots.

Step 3

Exam Tip

यहाँ (D=\(-5\sqrt{2}\)2-4(2)(12)=50-96=-46) है। ऋणात्मक विविक्तकर का अर्थ कोई वास्तविक मूल नहीं है।

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समीकरण \(3x^2-2\sqrt{6}x+2=0\) के मूलों की प्रकृति बताइए।

State the nature of roots of \(3x^2-2\sqrt{6}x+2=0\).

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-2\sqrt{6}\)2-4(3)(2)=0). Hence both roots are equal.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-2\sqrt{6}\)2-4(3)(2)=0). Hence both roots are equal.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{6}\)2-4(3)(2)=0) है। अतः दोनों मूल समान हैं।

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समीकरण \(x^2-2\sqrt{5}x+6=0\) के लिए सही निष्कर्ष चुनिए।

Choose the correct conclusion for \(x^2-2\sqrt{5}x+6=0\).

Explanation opens after your attempt
Correct Answer

A. कोई वास्तविक मूल नहीं ((D=-4))No real roots ((D=-4))

Step 1

Concept

Here (D=\(-2\sqrt{5}\)2-4(1)(6)=-4). A negative (D) gives no real roots.

Step 2

Why this answer is correct

The correct answer is A. कोई वास्तविक मूल नहीं ((D=-4)) / No real roots ((D=-4)). Here (D=\(-2\sqrt{5}\)2-4(1)(6)=-4). A negative (D) gives no real roots.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{5}\)2-4(1)(6)=-4) है। ऋणात्मक (D) वास्तविक मूल नहीं देता।

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समीकरण \(4x^2-4\sqrt{3}x+3=0\) के मूलों की प्रकृति क्या है?

What is the nature of roots of \(4x^2-4\sqrt{3}x+3=0\)?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और समान ((D=0))Two real and equal ((D=0))

Step 1

Concept

Here (D=\(-4\sqrt{3}\)2-4(4)(3)=0). When (D=0), both roots are equal.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और समान ((D=0)) / Two real and equal ((D=0)). Here (D=\(-4\sqrt{3}\)2-4(4)(3)=0). When (D=0), both roots are equal.

Step 3

Exam Tip

यहाँ (D=\(-4\sqrt{3}\)2-4(4)(3)=0) है। (D=0) होने पर दोनों मूल समान होते हैं।

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यदि \(x^2-2\sqrt{n}x+4=0\) के मूल वास्तविक और समान हैं, तो (n) का मान क्या होगा?

If \(x^2-2\sqrt{n}x+4=0\) has real and equal roots, what is the value of (n)?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

For equal roots, (D=0) is required. Here (D=4n-16), so (n=4).

Step 2

Why this answer is correct

The correct answer is A. (4). For equal roots, (D=0) is required. Here (D=4n-16), so (n=4).

Step 3

Exam Tip

समान मूलों के लिए (D=0) चाहिए। यहाँ (D=4n-16), इसलिए (n=4)।

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समीकरण \(x^2-2\sqrt{7}x+3=0\) के मूल कैसे होंगे?

How will the roots of \(x^2-2\sqrt{7}x+3=0\) be?

Explanation opens after your attempt
Correct Answer

A. वास्तविक, अपरिमेय और भिन्नReal, irrational and distinct

Step 1

Concept

Here (D=\(2\sqrt{7}\)2-4(1)(3)=16). The roots are \(\sqrt{7}\pm2\), so they are irrational and distinct.

Step 2

Why this answer is correct

The correct answer is A. वास्तविक, अपरिमेय और भिन्न / Real, irrational and distinct. Here (D=\(2\sqrt{7}\)2-4(1)(3)=16). The roots are \(\sqrt{7}\pm2\), so they are irrational and distinct.

Step 3

Exam Tip

यहाँ (D=\(2\sqrt{7}\)2-4(1)(3)=16) है। मूल \(\sqrt{7}\pm2\) होंगे, इसलिए वे अपरिमेय और भिन्न हैं।

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समीकरण \(3x^2-2\sqrt{15}x+5=0\) के मूलों की प्रकृति क्या है?

What is the nature of roots of \(3x^2-2\sqrt{15}x+5=0\)?

Explanation opens after your attempt
Correct Answer

A. वास्तविक और समानReal and equal

Step 1

Concept

Here (D=\(-2\sqrt{15}\)2-4(3)(5)=60-60=0). Therefore the roots are real and equal.

Step 2

Why this answer is correct

The correct answer is A. वास्तविक और समान / Real and equal. Here (D=\(-2\sqrt{15}\)2-4(3)(5)=60-60=0). Therefore the roots are real and equal.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{15}\)2-4(3)(5)=60-60=0) है। इसलिए मूल वास्तविक और समान हैं।

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समीकरण \(x^2-2\sqrt{5}x+1=0\) के मूलों की प्रकृति चुनिए।

Choose the nature of roots of \(x^2-2\sqrt{5}x+1=0\).

Explanation opens after your attempt
Correct Answer

A. वास्तविक, अपरिमेय और भिन्नReal, irrational and distinct

Step 1

Concept

Here (D=\(2\sqrt{5}\)2-4(1)(1)=16>0). The roots are \(\sqrt{5}\pm2\), so they are irrational and distinct.

Step 2

Why this answer is correct

The correct answer is A. वास्तविक, अपरिमेय और भिन्न / Real, irrational and distinct. Here (D=\(2\sqrt{5}\)2-4(1)(1)=16>0). The roots are \(\sqrt{5}\pm2\), so they are irrational and distinct.

Step 3

Exam Tip

यहाँ (D=\(2\sqrt{5}\)2-4(1)(1)=16>0) है। मूल \(\sqrt{5}\pm2\) होंगे, इसलिए वे अपरिमेय और भिन्न हैं।

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समीकरण \(3x^2+2\sqrt{3}x+1=0\) के मूलों की प्रकृति क्या है?

What is the nature of roots of \(3x^2+2\sqrt{3}x+1=0\)?

Explanation opens after your attempt
Correct Answer

A. वास्तविक और समानReal and equal

Step 1

Concept

Here (D=\(2\sqrt{3}\)2-4(3)(1)=12-12=0). Hence the roots are real and equal.

Step 2

Why this answer is correct

The correct answer is A. वास्तविक और समान / Real and equal. Here (D=\(2\sqrt{3}\)2-4(3)(1)=12-12=0). Hence the roots are real and equal.

Step 3

Exam Tip

यहाँ (D=\(2\sqrt{3}\)2-4(3)(1)=12-12=0) है। अतः मूल वास्तविक और समान हैं।

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यदि \(x^2+ax+b=0\) की जड़ें \(\frac{1}{4+\sqrt{3}}\) और \(\frac{1}{4-\sqrt{3}}\) हैं, तो (a) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(\frac{1}{4+\sqrt{3}}\) and \(\frac{1}{4-\sqrt{3}}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. -\(\frac{8}{13}\)

Step 1

Concept

The sum of roots is \(\frac{1}{4+\sqrt{3}}+\frac{1}{4-\sqrt{3}}=\frac{8}{13}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{8}{13}\).

Step 2

Why this answer is correct

The correct answer is A. -\(\frac{8}{13}\). The sum of roots is \(\frac{1}{4+\sqrt{3}}+\frac{1}{4-\sqrt{3}}=\frac{8}{13}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{8}{13}\).

Step 3

Exam Tip

जड़ों का योग \(\frac{1}{4+\sqrt{3}}+\frac{1}{4-\sqrt{3}}=\frac{8}{13}\) है। \(x^2+ax+b=0\) में योग (-a) होता है, इसलिए \(a=-\frac{8}{13}\)।

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यदि \(x^2+ax+b=0\) की जड़ें \(4+\sqrt{7}\) और \(4-\sqrt{7}\) हैं, तो (a+b) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(4+\sqrt{7}\) and \(4-\sqrt{7}\), what is (a+b)?

Explanation opens after your attempt
Correct Answer

B. (1)

Step 1

Concept

The sum of roots is (8), so (a=-8). The product is (9), so (b=9), hence (a+b=1).

Step 2

Why this answer is correct

The correct answer is B. (1). The sum of roots is (8), so (a=-8). The product is (9), so (b=9), hence (a+b=1).

Step 3

Exam Tip

जड़ों का योग (8) है, इसलिए (a=-8)। गुणनफल (9) है, इसलिए (b=9), अतः (a+b=1)।

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यदि \(x^2+ax+b=0\) की जड़ें \(\frac{1}{3+\sqrt{5}}\) और \(\frac{1}{3-\sqrt{5}}\) हैं, तो (a) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(\frac{1}{3+\sqrt{5}}\) and \(\frac{1}{3-\sqrt{5}}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. \(-\frac{3}{2}\)

Step 1

Concept

After rationalising, the sum of roots is \(\frac{3}{2}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{3}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(-\frac{3}{2}\). After rationalising, the sum of roots is \(\frac{3}{2}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{3}{2}\).

Step 3

Exam Tip

रैशनलाइज करने पर जड़ों का योग \(\frac{3}{2}\) मिलता है। \(x^2+ax+b=0\) में जड़ों का योग (-a) होता है, इसलिए \(a=-\frac{3}{2}\)।

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यदि \(x^2+ax+b=0\) की जड़ें \(3+\sqrt{2}\) और \(3-\sqrt{2}\) हैं, तो (a+b) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(3+\sqrt{2}\) and \(3-\sqrt{2}\), what is (a+b)?

Explanation opens after your attempt
Correct Answer

B. (1)

Step 1

Concept

The sum of roots is (6), so (a=-6). The product is (7), so (b=7), hence (a+b=1).

Step 2

Why this answer is correct

The correct answer is B. (1). The sum of roots is (6), so (a=-6). The product is (7), so (b=7), hence (a+b=1).

Step 3

Exam Tip

जड़ों का योग (6) है, इसलिए (a=-6)। गुणनफल (7) है, इसलिए (b=7), अतः (a+b=1)।

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यदि \(x^2+ax+b=0\) की जड़ें \(\frac{1}{2+\sqrt{3}}\) और \(\frac{1}{2-\sqrt{3}}\) हैं, तो (a) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(\frac{1}{2+\sqrt{3}}\) and \(\frac{1}{2-\sqrt{3}}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. (-4)

Step 1

Concept

The given roots become \(2-\sqrt{3}\) and \(2+\sqrt{3}\). Their sum is (4), so (a=-4).

Step 2

Why this answer is correct

The correct answer is A. (-4). The given roots become \(2-\sqrt{3}\) and \(2+\sqrt{3}\). Their sum is (4), so (a=-4).

Step 3

Exam Tip

दी गई जड़ें \(2-\sqrt{3}\) और \(2+\sqrt{3}\) बनती हैं। उनका योग (4) है, इसलिए (a=-4)।

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यदि \(x^2+ax+b=0\) की जड़ें \(2+\sqrt{3}\) और \(2-\sqrt{3}\) हैं, तो (a+b) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(2+\sqrt{3}\) and \(2-\sqrt{3}\), what is (a+b)?

Explanation opens after your attempt
Correct Answer

A. (-3)

Step 1

Concept

The sum of roots is (4), so (a=-4). The product is (1), so (b=1), hence (a+b=-3).

Step 2

Why this answer is correct

The correct answer is A. (-3). The sum of roots is (4), so (a=-4). The product is (1), so (b=1), hence (a+b=-3).

Step 3

Exam Tip

जड़ों का योग (4) है, इसलिए (a=-4)। गुणनफल (1) है, इसलिए (b=1), अतः (a+b=-3)।

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यदि किसी द्विघात समीकरण की जड़ें \(2+\sqrt{5}\) और \(2-\sqrt{5}\) हैं, तो समीकरण कौन-सा है?

If the roots of a quadratic equation are \(2+\sqrt{5}\) and \(2-\sqrt{5}\), which is the equation?

Explanation opens after your attempt
Correct Answer

A. \(x^2-4x-1=0\)

Step 1

Concept

\(The sum of roots is (4) and the product is (-1). Use (x^2-(\)sum)x+product\(=0) to get the answer.\)

Step 2

Why this answer is correct

\(The correct answer is A. (x^2-4x-1=0). The sum of roots is (4) and the product is (-1). Use (x^2-(\)sum)x+product\(=0) to get the answer.\)

Step 3

Exam Tip

जड़ों का योग (4) और गुणनफल (-1) है। \(समीकरण (x^2-(\)योग)x+गुणनफल\(=0) से उत्तर मिलता है\)।

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कौन सा विकल्प (\(\sqrt{14}+\sqrt{6}\)\(\sqrt{14}-\sqrt{6}\)+\sqrt{84}) के बराबर है?

Which option is equal to (\(\sqrt{14}+\sqrt{6}\)\(\sqrt{14}-\sqrt{6}\)+\sqrt{84})?

Explanation opens after your attempt
Correct Answer

A. \(8+2\sqrt{21}\)

Step 1

Concept

The first product is (14-6=8), and \(\sqrt{84}=2\sqrt{21}\). In exams use both conjugate multiplication and radical simplification.

Step 2

Why this answer is correct

The correct answer is A. \(8+2\sqrt{21}\). The first product is (14-6=8), and \(\sqrt{84}=2\sqrt{21}\). In exams use both conjugate multiplication and radical simplification.

Step 3

Exam Tip

पहला गुणनफल (14-6=8) है और \(\sqrt{84}=2\sqrt{21}\) है। परीक्षा में संयुग्मी गुणन और मूल सरलीकरण दोनों करें।

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\(\frac{\sqrt{17}+\sqrt{13}}{\sqrt{17}-\sqrt{13}}\) का सरलतम परिमेयकृत रूप क्या है?

What is the simplest rationalized form of \(\frac{\sqrt{17}+\sqrt{13}}{\sqrt{17}-\sqrt{13}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{15+\sqrt{221}}{2}\)

Step 1

Concept

Multiplying by the conjugate gives \(\frac{30+2\sqrt{221}}{4}=\frac{15+\sqrt{221}}{2}\). In exams divide by the common factor at the end.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{15+\sqrt{221}}{2}\). Multiplying by the conjugate gives \(\frac{30+2\sqrt{221}}{4}=\frac{15+\sqrt{221}}{2}\). In exams divide by the common factor at the end.

Step 3

Exam Tip

हर के संयुग्मी से गुणा करने पर \(\frac{30+2\sqrt{221}}{4}=\frac{15+\sqrt{221}}{2}\) मिलता है। परीक्षा में अंत में समान गुणनखंड से भाग जरूर करें।

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यदि \(x=1+\sqrt{2}\), तो \(x^3-3x\) का सही मान क्या है?

If \(x=1+\sqrt{2}\), what is the correct value of \(x^3-3x\)?

Explanation opens after your attempt
Correct Answer

A. \(4+2\sqrt{2}\)

Step 1

Concept

\(x^3=7+5\sqrt{2}\) and \(3x=3+3\sqrt{2}\), so the difference is \(4+2\sqrt{2}\). In exams calculate powers step by step.

Step 2

Why this answer is correct

The correct answer is A. \(4+2\sqrt{2}\). \(x^3=7+5\sqrt{2}\) and \(3x=3+3\sqrt{2}\), so the difference is \(4+2\sqrt{2}\). In exams calculate powers step by step.

Step 3

Exam Tip

\(x^3=7+5\sqrt{2}\) और \(3x=3+3\sqrt{2}\), इसलिए अंतर \(4+2\sqrt{2}\) है। परीक्षा में घातों की गणना चरणों में करें।

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यदि \(x=1+\sqrt{2}\), तो \(x^3-3x\) का मान क्या है?

If \(x=1+\sqrt{2}\), what is the value of \(x^3-3x\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{2}\)

Step 1

Concept

\(x^2=3+2\sqrt{2}\) and \(x^3=7+5\sqrt{2}\), so \(x^3-3x=4+2\sqrt{2}\). The correct value is not in the options so calculate carefully.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{2}\). \(x^2=3+2\sqrt{2}\) and \(x^3=7+5\sqrt{2}\), so \(x^3-3x=4+2\sqrt{2}\). The correct value is not in the options so calculate carefully.

Step 3

Exam Tip

\(x^2=3+2\sqrt{2}\) और \(x^3=7+5\sqrt{2}\), इसलिए \(x^3-3x=4+2\sqrt{2}\) होता है। सही मान विकल्पों में नहीं है इसलिए गणना सावधानी से करें।

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किस विकल्प में \(\sqrt{50}+3\sqrt{8}-\sqrt{18}\) का सही सरल रूप है?

Which option gives the correct simplified form of \(\sqrt{50}+3\sqrt{8}-\sqrt{18}\)?

Explanation opens after your attempt
Correct Answer

A. \(8\sqrt{2}\)

Step 1

Concept

\(\sqrt{50}=5\sqrt{2}\), \(3\sqrt{8}=6\sqrt{2}\) and \(\sqrt{18}=3\sqrt{2}\). Hence the value is \(8\sqrt{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(8\sqrt{2}\). \(\sqrt{50}=5\sqrt{2}\), \(3\sqrt{8}=6\sqrt{2}\) and \(\sqrt{18}=3\sqrt{2}\). Hence the value is \(8\sqrt{2}\).

Step 3

Exam Tip

\(\sqrt{50}=5\sqrt{2}\), \(3\sqrt{8}=6\sqrt{2}\) और \(\sqrt{18}=3\sqrt{2}\) है। इसलिए मान \(8\sqrt{2}\) है।

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\(\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}\) का परिमेयकृत रूप क्या है?

What is the rationalized form of \(\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

C. \(\frac{4-\sqrt{15}}{2}\)

Step 1

Concept

Multiplying by the conjugate gives numerator (\(\sqrt{5}-\sqrt{3}\)2=8-2\sqrt{15}) and denominator (2). So the value is \(4-\sqrt{15}\) and the correct simple option is A.

Step 2

Why this answer is correct

The correct answer is C. \(\frac{4-\sqrt{15}}{2}\). Multiplying by the conjugate gives numerator (\(\sqrt{5}-\sqrt{3}\)2=8-2\sqrt{15}) and denominator (2). So the value is \(4-\sqrt{15}\) and the correct simple option is A.

Step 3

Exam Tip

हर के संयुग्मी से गुणा करने पर अंश (\(\sqrt{5}-\sqrt{3}\)2=8-2\sqrt{15}) और हर (2) बनता है। इसलिए मान \(4-\sqrt{15}\) है पर सही सरल विकल्प A है।

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कौन सा विकल्प \(\sqrt{72}-\sqrt{50}+\sqrt{8}\) के बराबर है?

Which option is equal to \(\sqrt{72}-\sqrt{50}+\sqrt{8}\)?

Explanation opens after your attempt
Correct Answer

A. \(3\sqrt{2}\)

Step 1

Concept

\(\sqrt{72}=6\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\) and \(\sqrt{8}=2\sqrt{2}\). Hence the value is \(3\sqrt{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(3\sqrt{2}\). \(\sqrt{72}=6\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\) and \(\sqrt{8}=2\sqrt{2}\). Hence the value is \(3\sqrt{2}\).

Step 3

Exam Tip

\(\sqrt{72}=6\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\) और \(\sqrt{8}=2\sqrt{2}\) है। इसलिए मान \(3\sqrt{2}\) है।

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यदि \(x=\sqrt{11}-\sqrt{2}\), तो \(x^2\) क्या है?

If \(x=\sqrt{11}-\sqrt{2}\), what is \(x^2\)?

Explanation opens after your attempt
Correct Answer

A. \(13-2\sqrt{22}\)

Step 1

Concept

\(x^2=11+2-2\sqrt{22}=13-2\sqrt{22}\). In exams do not forget the middle term of ((a-b)2).

Step 2

Why this answer is correct

The correct answer is A. \(13-2\sqrt{22}\). \(x^2=11+2-2\sqrt{22}=13-2\sqrt{22}\). In exams do not forget the middle term of ((a-b)2).

Step 3

Exam Tip

\(x^2=11+2-2\sqrt{22}=13-2\sqrt{22}\) है। परीक्षा में ((a-b)2) का मध्य पद न भूलें।

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यदि \(x=\sqrt{8}-\sqrt{2}\), तो (x) किसके बराबर है?

If \(x=\sqrt{8}-\sqrt{2}\), what is (x) equal to?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\), so \(\sqrt{8}-\sqrt{2}=\sqrt{2}\). In exams simplify radicals first.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\). \(\sqrt{8}=2\sqrt{2}\), so \(\sqrt{8}-\sqrt{2}=\sqrt{2}\). In exams simplify radicals first.

Step 3

Exam Tip

\(\sqrt{8}=2\sqrt{2}\), इसलिए \(\sqrt{8}-\sqrt{2}=\sqrt{2}\) है। परीक्षा में पहले मूलों को सरल करें।

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\(\sqrt{27}+\sqrt{75}-\sqrt{12}\) का सरल रूप क्या है?

What is the simplified form of \(\sqrt{27}+\sqrt{75}-\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

A. \(6\sqrt{3}\)

Step 1

Concept

\(\sqrt{27}=3\sqrt{3}\), \(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\). Hence the value is \(6\sqrt{3}\).

Step 2

Why this answer is correct

The correct answer is A. \(6\sqrt{3}\). \(\sqrt{27}=3\sqrt{3}\), \(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\). Hence the value is \(6\sqrt{3}\).

Step 3

Exam Tip

\(\sqrt{27}=3\sqrt{3}\), \(\sqrt{75}=5\sqrt{3}\) और \(\sqrt{12}=2\sqrt{3}\) है। इसलिए मान \(6\sqrt{3}\) है।

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यदि \(a=\sqrt{13}+\sqrt{6}\) और \(b=\sqrt{13}-\sqrt{6}\), तो (ab) का मान क्या है?

If \(a=\sqrt{13}+\sqrt{6}\) and \(b=\sqrt{13}-\sqrt{6}\), what is the value of (ab)?

Explanation opens after your attempt
Correct Answer

A. (7)

Step 1

Concept

(ab=13-6=7). In exams conjugate multiplication removes radicals.

Step 2

Why this answer is correct

The correct answer is A. (7). (ab=13-6=7). In exams conjugate multiplication removes radicals.

Step 3

Exam Tip

(ab=13-6=7) है। परीक्षा में संयुग्मी गुणन से मूल हट जाते हैं।

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यदि \(x=\sqrt{7}+\sqrt{5}\), तो \(x^2\) का सही मान क्या है?

If \(x=\sqrt{7}+\sqrt{5}\), what is the correct value of \(x^2\)?

Explanation opens after your attempt
Correct Answer

A. \(12+2\sqrt{35}\)

Step 1

Concept

\(x^2=7+5+2\sqrt{35}=12+2\sqrt{35}\). In exams do not miss (2ab) in ((a+b)2).

Step 2

Why this answer is correct

The correct answer is A. \(12+2\sqrt{35}\). \(x^2=7+5+2\sqrt{35}=12+2\sqrt{35}\). In exams do not miss (2ab) in ((a+b)2).

Step 3

Exam Tip

\(x^2=7+5+2\sqrt{35}=12+2\sqrt{35}\) है। परीक्षा में ((a+b)2) में (2ab) न छोड़ें।

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किस विकल्प में \(\sqrt{3}\) और \(\sqrt{12}\) का योग परिमेय गुणांक वाले सरल अपरिमेय रूप में सही लिखा गया है?

In which option is the sum of \(\sqrt{3}\) and \(\sqrt{12}\) correctly written as a simple irrational form with rational coefficient?

Explanation opens after your attempt
Correct Answer

A. \(3\sqrt{3}\)

Step 1

Concept

\(\sqrt{12}=2\sqrt{3}\), so \(\sqrt{3}+\sqrt{12}=3\sqrt{3}\). In exams make radicals like terms before adding.

Step 2

Why this answer is correct

The correct answer is A. \(3\sqrt{3}\). \(\sqrt{12}=2\sqrt{3}\), so \(\sqrt{3}+\sqrt{12}=3\sqrt{3}\). In exams make radicals like terms before adding.

Step 3

Exam Tip

\(\sqrt{12}=2\sqrt{3}\), इसलिए \(\sqrt{3}+\sqrt{12}=3\sqrt{3}\) है। परीक्षा में मूलों को जोड़ने से पहले समान मूल बनाएं।

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\(\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}\) का परिमेयकृत रूप क्या है?

What is the rationalized form of \(\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. \(5+2\sqrt{6}\)

Step 1

Concept

Multiplying by the conjugate of the denominator gives denominator (1) and numerator (\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}). In exams apply the conjugate in one step.

Step 2

Why this answer is correct

The correct answer is A. \(5+2\sqrt{6}\). Multiplying by the conjugate of the denominator gives denominator (1) and numerator (\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}). In exams apply the conjugate in one step.

Step 3

Exam Tip

हर के संयुग्मी से गुणा करने पर हर (1) और अंश (\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}) बनता है। परीक्षा में एक ही चरण में संयुग्मी लगाएं।

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यदि \(\sqrt{12}+\sqrt{27}\) को पहले सरल किया जाए, तो इसका वर्ग क्या होगा?

If \(\sqrt{12}+\sqrt{27}\) is simplified first, what will its square be?

Explanation opens after your attempt
Correct Answer

A. (75)

Step 1

Concept

\(\sqrt{12}+\sqrt{27}=2\sqrt{3}+3\sqrt{3}=5\sqrt{3}\), so the square is (75). In exams add like radicals first.

Step 2

Why this answer is correct

The correct answer is A. (75). \(\sqrt{12}+\sqrt{27}=2\sqrt{3}+3\sqrt{3}=5\sqrt{3}\), so the square is (75). In exams add like radicals first.

Step 3

Exam Tip

\(\sqrt{12}+\sqrt{27}=2\sqrt{3}+3\sqrt{3}=5\sqrt{3}\), इसलिए वर्ग (75) है। परीक्षा में समान मूलों को पहले जोड़ें।

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कौन सा विकल्प (\(\sqrt{12}+\sqrt{27}\)2) के बराबर है?

Which option is equal to (\(\sqrt{12}+\sqrt{27}\)2)?

Explanation opens after your attempt
Correct Answer

A. \(75+36\sqrt{3}\)

Step 1

Concept

\(\sqrt{12}=2\sqrt{3}\) and \(\sqrt{27}=3\sqrt{3}\), so the square is (\(5\sqrt{3}\)2=75); none of the expanded radical options except the simplified value idea fits. In exams simplify before expanding.

Step 2

Why this answer is correct

The correct answer is A. \(75+36\sqrt{3}\). \(\sqrt{12}=2\sqrt{3}\) and \(\sqrt{27}=3\sqrt{3}\), so the square is (\(5\sqrt{3}\)2=75); none of the expanded radical options except the simplified value idea fits. In exams simplify before expanding.

Step 3

Exam Tip

\(\sqrt{12}=2\sqrt{3}\) और \(\sqrt{27}=3\sqrt{3}\), इसलिए वर्ग (\(5\sqrt{3}\)2=75) होना चाहिए, पर विकल्पों में विस्तार विधि से सही मान (75) अकेला नहीं है। परीक्षा में पहले सरलीकरण करें।

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कौन सा विकल्प \(\sqrt{50}-\sqrt{32}+\sqrt{2}\) के बराबर है?

Which option is equal to \(\sqrt{50}-\sqrt{32}+\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{2}\)

Step 1

Concept

\(\sqrt{50}=5\sqrt{2}\) and \(\sqrt{32}=4\sqrt{2}\), so the value is \(2\sqrt{2}\). In exams handle signs carefully.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{2}\). \(\sqrt{50}=5\sqrt{2}\) and \(\sqrt{32}=4\sqrt{2}\), so the value is \(2\sqrt{2}\). In exams handle signs carefully.

Step 3

Exam Tip

\(\sqrt{50}=5\sqrt{2}\) और \(\sqrt{32}=4\sqrt{2}\), इसलिए मान \(2\sqrt{2}\) है। परीक्षा में चिन्हों को सावधानी से रखें।

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यदि \(x=\sqrt{7}-\sqrt{3}\), तो \(x^2\) क्या है?

If \(x=\sqrt{7}-\sqrt{3}\), what is \(x^2\)?

Explanation opens after your attempt
Correct Answer

A. \(10-2\sqrt{21}\)

Step 1

Concept

\(x^2=7+3-2\sqrt{21}=10-2\sqrt{21}\). In exams apply ((a-b)2=a-2+b-2-2ab).

Step 2

Why this answer is correct

The correct answer is A. \(10-2\sqrt{21}\). \(x^2=7+3-2\sqrt{21}=10-2\sqrt{21}\). In exams apply ((a-b)2=a-2+b-2-2ab).

Step 3

Exam Tip

\(x^2=7+3-2\sqrt{21}=10-2\sqrt{21}\) है। परीक्षा में ((a-b)2=a-2+b-2-2ab) लगाएं।

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कौन सा व्यंजक परिमेय संख्या नहीं है?

Which expression is not a rational number?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{20}+\sqrt{45}\)

Step 1

Concept

\(\sqrt{20}+\sqrt{45}=2\sqrt{5}+3\sqrt{5}=5\sqrt{5}\), which is irrational. In exams do not treat addition like multiplication.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{20}+\sqrt{45}\). \(\sqrt{20}+\sqrt{45}=2\sqrt{5}+3\sqrt{5}=5\sqrt{5}\), which is irrational. In exams do not treat addition like multiplication.

Step 3

Exam Tip

\(\sqrt{20}+\sqrt{45}=2\sqrt{5}+3\sqrt{5}=5\sqrt{5}\), जो अपरिमेय है। परीक्षा में योग को गुणन जैसा न मानें।

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किस संख्या का वर्ग \(7+4\sqrt{3}\) है?

Whose square is \(7+4\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. \(2+\sqrt{3}\)

Step 1

Concept

(\(2+\sqrt{3}\)2=4+3+4\sqrt{3}=7+4\sqrt{3}). In exams pay attention to the (2ab) term.

Step 2

Why this answer is correct

The correct answer is A. \(2+\sqrt{3}\). (\(2+\sqrt{3}\)2=4+3+4\sqrt{3}=7+4\sqrt{3}). In exams pay attention to the (2ab) term.

Step 3

Exam Tip

(\(2+\sqrt{3}\)2=4+3+4\sqrt{3}=7+4\sqrt{3}) है। परीक्षा में (2ab) वाले पद पर ध्यान दें।

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यदि \(x=\sqrt{6}+\sqrt{2}\), तो \(x^2\) का सही रूप क्या है?

If \(x=\sqrt{6}+\sqrt{2}\), what is the correct form of \(x^2\)?

Explanation opens after your attempt
Correct Answer

A. \(8+4\sqrt{3}\)

Step 1

Concept

\(x^2=6+2+2\sqrt{12}=8+4\sqrt{3}\). In exams do not forget to simplify \(\sqrt{12}=2\sqrt{3}\).

Step 2

Why this answer is correct

The correct answer is A. \(8+4\sqrt{3}\). \(x^2=6+2+2\sqrt{12}=8+4\sqrt{3}\). In exams do not forget to simplify \(\sqrt{12}=2\sqrt{3}\).

Step 3

Exam Tip

\(x^2=6+2+2\sqrt{12}=8+4\sqrt{3}\) है। परीक्षा में \(\sqrt{12}=2\sqrt{3}\) सरल करना न भूलें।

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यदि \(x=\frac{2}{\sqrt{3}+1}\), तो (x) किसके बराबर है?

If \(x=\frac{2}{\sqrt{3}+1}\), what is (x) equal to?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}-1\)

Step 1

Concept

(\frac{2}{\sqrt{3}+1}\times\frac{\sqrt{3}-1}{\sqrt{3}-1}=\frac{2\(\sqrt{3}-1\)}{2}=\sqrt{3}-1). The conjugate makes the denominator rational.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{3}-1\). (\frac{2}{\sqrt{3}+1}\times\frac{\sqrt{3}-1}{\sqrt{3}-1}=\frac{2\(\sqrt{3}-1\)}{2}=\sqrt{3}-1). The conjugate makes the denominator rational.

Step 3

Exam Tip

(\frac{2}{\sqrt{3}+1}\times\frac{\sqrt{3}-1}{\sqrt{3}-1}=\frac{2\(\sqrt{3}-1\)}{2}=\sqrt{3}-1) है। परीक्षा में संयुग्मी से हर परिमेय बनता है।

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यदि \(a=\sqrt{27}-\sqrt{12}\), तो (a) का मान क्या है?

If \(a=\sqrt{27}-\sqrt{12}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}\)

Step 1

Concept

\(\sqrt{27}=3\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\), so the difference is \(\sqrt{3}\). Simplify first in exams.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{3}\). \(\sqrt{27}=3\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\), so the difference is \(\sqrt{3}\). Simplify first in exams.

Step 3

Exam Tip

\(\sqrt{27}=3\sqrt{3}\) और \(\sqrt{12}=2\sqrt{3}\), इसलिए अंतर \(\sqrt{3}\) है। परीक्षा में पहले सरलीकरण करें।

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कौन-सा विकल्प \(\sqrt{2}+\sqrt{18}-\sqrt{50}+\sqrt{98}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{2}+\sqrt{18}-\sqrt{50}+\sqrt{98}\)?

Explanation opens after your attempt
Correct Answer

A. \(6\sqrt{2}\)

Step 1

Concept

\(\sqrt{18}=3\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\), and \(\sqrt{98}=7\sqrt{2}\).

Step 2

Why this answer is correct

\(1\sqrt{2}+3\sqrt{2}-5\sqrt{2}+7\sqrt{2}=6\sqrt{2}\).

Step 3

Exam Tip

In long surd expressions, write the coefficients separately and add them. चरण 1: \(\sqrt{18}=3\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\), और \(\sqrt{98}=7\sqrt{2}\)। चरण 2: \(1\sqrt{2}+3\sqrt{2}-5\sqrt{2}+7\sqrt{2}=6\sqrt{2}\)। चरण 3: लंबे मूल वाले प्रश्न में गुणांक अलग लिखकर जोड़ना आसान रहता है।

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यदि \(x=\sqrt{7}+2\), तो ((x-2)(x+2)) का मान क्या है?

If \(x=\sqrt{7}+2\), what is the value of ((x-2)(x+2))?

Explanation opens after your attempt
Correct Answer

A. \(7+4\sqrt{7}\)

Step 1

Concept

((x-2)=\sqrt{7}) and ((x+2)=\sqrt{7}+4).

Step 2

Why this answer is correct

The product is (\sqrt{7}\(\sqrt{7}+4\)=7+4\sqrt{7}).

Step 3

Exam Tip

Before applying an identity directly, substitute the given value of (x) carefully. चरण 1: ((x-2)=\sqrt{7}) और ((x+2)=\sqrt{7}+4)। चरण 2: गुणन (\sqrt{7}\(\sqrt{7}+4\)=7+4\sqrt{7}) है। चरण 3: सीधे सूत्र लगाने से पहले (x) का दिया हुआ मान ध्यान से रखें।

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यदि \(x=\sqrt{5}+\sqrt{2}\), तो (\(x^2-7\)2) का मान क्या है?

If \(x=\sqrt{5}+\sqrt{2}\), what is the value of (\(x^2-7\)2)?

Explanation opens after your attempt
Correct Answer

A. (40)

Step 1

Concept

\(x^2=5+2+2\sqrt{10}=7+2\sqrt{10}\).

Step 2

Why this answer is correct

Thus \(x^2-7=2\sqrt{10}\), and its square is (40).

Step 3

Exam Tip

First isolate the irrational part, then square it. चरण 1: \(x^2=5+2+2\sqrt{10}=7+2\sqrt{10}\)। चरण 2: इसलिए \(x^2-7=2\sqrt{10}\), और इसका वर्ग (40) है। चरण 3: पहले परिमेय भाग अलग करें, फिर वर्ग करें।

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कौन-सा विकल्प \(\sqrt{45}\) और \(2\sqrt{5}\) के अंतर को सही बताता है?

Which option correctly gives the difference between \(\sqrt{45}\) and \(2\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{5}\)

Step 1

Concept

\(\sqrt{45}=3\sqrt{5}\).

Step 2

Why this answer is correct

The difference is \(3\sqrt{5}-2\sqrt{5}=\sqrt{5}\), which is irrational.

Step 3

Exam Tip

For like surds, subtract only the coefficients. चरण 1: \(\sqrt{45}=3\sqrt{5}\) है। चरण 2: अंतर \(3\sqrt{5}-2\sqrt{5}=\sqrt{5}\), जो अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल गुणांक घटाएँ।

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यदि \(x=\sqrt{2}\), तो \(\frac{x^6-8}{x^2-2}\) के बारे में सही कथन कौन-सा है?

If \(x=\sqrt{2}\), which statement about \(\frac{x^6-8}{x^2-2}\) is correct?

Explanation opens after your attempt
Correct Answer

A. यह अपरिभाषित हैIt is undefined

Step 1

Concept

For \(x=\sqrt{2}\), \(x^2=2\).

Step 2

Why this answer is correct

The denominator \(x^2-2=0\), so the fraction is undefined.

Step 3

Exam Tip

Before evaluating a fraction, always check whether the denominator becomes zero. चरण 1: \(x=\sqrt{2}\) होने पर \(x^2=2\)। चरण 2: हर \(x^2-2=0\) हो जाता है, इसलिए भिन्न अपरिभाषित है। चरण 3: भिन्न का मान निकालने से पहले हर शून्य तो नहीं, यह जरूर जाँचें।

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यदि \(x=\sqrt{3}+\sqrt{5}\) और \(y=\sqrt{5}+\sqrt{7}\), तो (y-x) की प्रकृति क्या है?

If \(x=\sqrt{3}+\sqrt{5}\) and \(y=\sqrt{5}+\sqrt{7}\), what is the nature of (y-x)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेयIrrational

Step 1

Concept

(y-x=\(\sqrt{5}+\sqrt{7}\)-\(\sqrt{3}+\sqrt{5}\)).

Step 2

Why this answer is correct

\(\sqrt{5}\) cancels and \(\sqrt{7}-\sqrt{3}\) remains, which is irrational.

Step 3

Exam Tip

After like terms cancel, check the nature of the remaining surds. चरण 1: (y-x=\(\sqrt{5}+\sqrt{7}\)-\(\sqrt{3}+\sqrt{5}\))। चरण 2: \(\sqrt{5}\) कट जाता है और \(\sqrt{7}-\sqrt{3}\) बचता है, जो अपरिमेय है। चरण 3: समान पद कटने के बाद बचे हुए मूलों की प्रकृति देखें।

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कौन-सा विकल्प \(\sqrt{96}-\sqrt{54}+\sqrt{24}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{96}-\sqrt{54}+\sqrt{24}\)?

Explanation opens after your attempt
Correct Answer

A. \(5\sqrt{6}\)

Step 1

Concept

\(\sqrt{96}=4\sqrt{6}\), \(\sqrt{54}=3\sqrt{6}\), and \(\sqrt{24}=2\sqrt{6}\).

Step 2

Why this answer is correct

\(4\sqrt{6}-3\sqrt{6}+2\sqrt{6}=3\sqrt{6}\), so the correct value is \(3\sqrt{6}\).

Step 3

Exam Tip

Match the options with your simplified result carefully. चरण 1: \(\sqrt{96}=4\sqrt{6}\), \(\sqrt{54}=3\sqrt{6}\), और \(\sqrt{24}=2\sqrt{6}\)। चरण 2: \(4\sqrt{6}-3\sqrt{6}+2\sqrt{6}=3\sqrt{6}\), इसलिए सही मान \(3\sqrt{6}\) है। चरण 3: विकल्प मिलाते समय अपनी सरल गणना से मिलान करें।

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यदि \(x=\sqrt{2}+\sqrt{5}\), तो (\(x-\sqrt{2}\)2) का मान क्या है?

If \(x=\sqrt{2}+\sqrt{5}\), what is the value of (\(x-\sqrt{2}\)2)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

\(x-\sqrt{2}=\sqrt{5}\).

Step 2

Why this answer is correct

Therefore (\(x-\sqrt{2}\)2=\(\sqrt{5}\)2=5).

Step 3

Exam Tip

Simplify inside the bracket before expanding the square. चरण 1: \(x-\sqrt{2}=\sqrt{5}\) है। चरण 2: इसलिए (\(x-\sqrt{2}\)2=\(\sqrt{5}\)2=5)। चरण 3: पूरे वर्ग को फैलाने से पहले कोष्ठक के अंदर सरल करें।

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यदि \(a=\sqrt{3}+\sqrt{2}\) और \(b=\sqrt{3}-\sqrt{2}\), तो \(\frac{a-b}{a+b}\) का मान क्या है?

If \(a=\sqrt{3}+\sqrt{2}\) and \(b=\sqrt{3}-\sqrt{2}\), what is the value of \(\frac{a-b}{a+b}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{6}}{3}\)

Step 1

Concept

\(a-b=2\sqrt{2}\) and \(a+b=2\sqrt{3}\).

Step 2

Why this answer is correct

\(\frac{a-b}{a+b}=\frac{\sqrt{2}}{\sqrt{3}}=\frac{\sqrt{6}}{3}\).

Step 3

Exam Tip

Do not forget to rationalize the denominator at the end. चरण 1: \(a-b=2\sqrt{2}\) और \(a+b=2\sqrt{3}\)। चरण 2: \(\frac{a-b}{a+b}=\frac{\sqrt{2}}{\sqrt{3}}=\frac{\sqrt{6}}{3}\)। चरण 3: अंत में हर को परिमेय बनाना न भूलें।

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कौन-सा विकल्प \(\frac{\sqrt{75}-\sqrt{12}}{\sqrt{3}}\) का सही मान है?

Which option is the correct value of \(\frac{\sqrt{75}-\sqrt{12}}{\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. (3)

Step 1

Concept

\(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\).

Step 2

Why this answer is correct

The numerator becomes \(3\sqrt{3}\), so division gives (3).

Step 3

Exam Tip

Subtract first, then divide by the denominator. चरण 1: \(\sqrt{75}=5\sqrt{3}\) और \(\sqrt{12}=2\sqrt{3}\) हैं। चरण 2: ऊपर का अंतर \(3\sqrt{3}\) है, इसलिए भाग देने पर (3) मिलता है। चरण 3: घटाव के बाद ही हर से भाग दें।

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