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14 results found for "conjugates" in Class 10.

Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सी संख्या परिमेय है, जबकि उसमें अपरिमेय वर्गमूल दिखाई दे रहे हैं?

Which number is rational even though irrational square roots appear in it?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The first option is a product of conjugate terms.

Step 2

Why this answer is correct

(\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\)=6-2=4), which is rational.

Step 3

Exam Tip

Identifying conjugates helps remove radicals quickly. चरण 1: पहला विकल्प संयुग्मी पदों का गुणनफल है। चरण 2: (\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\)=6-2=4), जो परिमेय है। चरण 3: संयुग्मी पद पहचानने से वर्गमूल जल्दी हट जाते हैं।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प (\(\sqrt{3}+1\)\(\sqrt{3}-1\)) का सही मान और प्रकार देता है?

Which option gives the correct value and type of (\(\sqrt{3}+1\)\(\sqrt{3}-1\))?

Explanation opens after your attempt
Correct Answer

A. (2) और परिमेय(2) and rational

Step 1

Concept

This is a difference of squares form.

Step 2

Why this answer is correct

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

Step 3

Exam Tip

Product of conjugates often removes the radical. चरण 1: यह अंतर के वर्ग का रूप है। चरण 2: (\(\sqrt{3}+1\)\(\sqrt{3}-1\)=3-1=2) जो परिमेय है। चरण 3: संयुग्मी पदों का गुणनफल अक्सर वर्गमूल हटा देता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=4+\sqrt{15}\) और \(y=4-\sqrt{15}\), तो \(x^2+y^2\) का मान क्या है?

If \(x=4+\sqrt{15}\) and \(y=4-\sqrt{15}\), what is the value of \(x^2+y^2\)?

Explanation opens after your attempt
Correct Answer

A. (62)

Step 1

Concept

(x) and (y) are conjugates.

Step 2

Why this answer is correct

(x-2+y-2=2\(4^2+15\)=2(31)=62).

Step 3

Exam Tip

In the sum of squares of conjugates, irrational terms cancel. चरण 1: (x) और (y) संयुग्मी हैं। चरण 2: (x-2+y-2=2\(4^2+15\)=2(31)=62)। चरण 3: संयुग्मी वर्गों के योग में अपरिमेय पद कट जाते हैं।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

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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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=5-\sqrt{24}\), तो \(\frac{1}{x}\) का सही रूप कौन-सा है?

If \(x=5-\sqrt{24}\), which is the correct form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(5+\sqrt{24}\)

Step 1

Concept

(\(5-\sqrt{24}\)\(5+\sqrt{24}\)=25-24=1).

Step 2

Why this answer is correct

Therefore \(5+\sqrt{24}\) is the reciprocal of \(5-\sqrt{24}\).

Step 3

Exam Tip

If conjugates multiply to (1), the reciprocal is directly the conjugate. चरण 1: (\(5-\sqrt{24}\)\(5+\sqrt{24}\)=25-24=1)। चरण 2: इसलिए \(5+\sqrt{24}\), \(5-\sqrt{24}\) का व्युत्क्रम है। चरण 3: यदि संयुग्मी गुणन (1) दे, तो व्युत्क्रम सीधे संयुग्मी होता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

किस विकल्प में (x) अपरिमेय है, पर \(x+\frac{1}{x}\) परिमेय है?

In which option is (x) irrational but \(x+\frac{1}{x}\) rational?

Explanation opens after your attempt
Correct Answer

A. \(x=3+\sqrt{8}\)

Step 1

Concept

\(3+\sqrt{8}=3+2\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

Its reciprocal is \(3-\sqrt{8}\), because (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=1). Hence the sum is (6), which is rational.

Step 3

Exam Tip

When conjugates multiply to (1), the reciprocal is easy to identify. चरण 1: \(3+\sqrt{8}=3+2\sqrt{2}\) अपरिमेय है। चरण 2: इसका व्युत्क्रम \(3-\sqrt{8}\) है, क्योंकि (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=1)। इसलिए योग (6) परिमेय है। चरण 3: जिन संयुग्मियों का गुणन (1) हो, वहाँ व्युत्क्रम तुरंत मिल सकता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

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

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

Explanation opens after your attempt
Correct Answer

A. (14)

Step 1

Concept

(x) and (y) are conjugates.

Step 2

Why this answer is correct

In (\(\sqrt{5}+\sqrt{2}\)2+\(\sqrt{5}-\sqrt{2}\)2), the middle irrational terms cancel and the value is (2(5+2)=14).

Step 3

Exam Tip

When adding squares of conjugates, the middle terms vanish. चरण 1: (x) और (y) संयुग्मी रूप में हैं। चरण 2: (\(\sqrt{5}+\sqrt{2}\)2+\(\sqrt{5}-\sqrt{2}\)2) में बीच के अपरिमेय पद कट जाते हैं और मान (2(5+2)=14) मिलता है। चरण 3: दो संयुग्मी वर्गों का योग लेते समय बीच वाले पद नहीं बचते।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\frac{1}{\sqrt{6}-\sqrt{5}}\), तो (x) किसके बराबर है?

If \(x=\frac{1}{\sqrt{6}-\sqrt{5}}\), what is (x) equal to?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The conjugate of the denominator is \(\sqrt{6}+\sqrt{5}\).

Step 2

Why this answer is correct

The denominator becomes (\(\sqrt{6}\)2-\(\sqrt{5}\)2=6-5=1).

Step 3

Exam Tip

When the denominator is a difference of two surds, multiply by its conjugate. चरण 1: हर का संयुग्मी \(\sqrt{6}+\sqrt{5}\) है। चरण 2: हर (\(\sqrt{6}\)2-\(\sqrt{5}\)2=6-5=1) बनता है। चरण 3: जब हर में दो मूलों का अंतर हो, तो संयुग्मी से गुणा करें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(a=5+\sqrt{7}\) और \(b=5-\sqrt{7}\), तो (ab) का मान क्या है?

If \(a=5+\sqrt{7}\) and \(b=5-\sqrt{7}\), what is the value of (ab)?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

This is multiplication of conjugates.

Step 2

Why this answer is correct

(ab=52-\(\sqrt{7}\)2=25-7=18).

Step 3

Exam Tip

In conjugate multiplication, the middle irrational terms cancel. चरण 1: यह संयुग्मी संख्याओं का गुणन है। चरण 2: (ab=52-\(\sqrt{7}\)2=25-7=18)। चरण 3: संयुग्मी गुणन में बीच के अपरिमेय पद कट जाते हैं।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(a=\sqrt{3}+2\) और \(b=\sqrt{3}-2\), तो (ab) की प्रकृति क्या है?

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

Explanation opens after your attempt
Correct Answer

A. परिमेय और ऋणात्मकRational and negative

Step 1

Concept

(a) and (b) are conjugates.

Step 2

Why this answer is correct

(ab=\(\sqrt{3}\)2-22=3-4=-1), which is rational and negative.

Step 3

Exam Tip

In conjugate multiplication, the middle irrational terms cancel. चरण 1: (a) और (b) संयुग्मी रूप में हैं। चरण 2: (ab=\(\sqrt{3}\)2-22=3-4=-1), जो परिमेय और ऋणात्मक है। चरण 3: संयुग्मी गुणन में बीच के अपरिमेय पद कट जाते हैं।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

निम्न में से कौन-सा मान \(1+\sqrt{2}\) और \(1-\sqrt{2}\) के गुणनफल के बराबर है?

Which value equals the product of \(1+\sqrt{2}\) and \(1-\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

C. (-1)

Step 1

Concept

This is a product of conjugates.

Step 2

Why this answer is correct

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

Step 3

Exam Tip

In conjugate multiplication, the middle irrational terms cancel. चरण 1: यह संयुग्मी संख्याओं का गुणन है। चरण 2: (\(1+\sqrt{2}\)\(1-\sqrt{2}\)=1-\(\sqrt{2}\)2=1-2=-1)। चरण 3: संयुग्मी गुणन में बीच के अपरिमेय पद कट जाते हैं।

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Question Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

(\left\(4+\sqrt{7}\right\)\left\(4-\sqrt{7}\right\)) का मान क्या है?

What is the value of (\left\(4+\sqrt{7}\right\)\left\(4-\sqrt{7}\right\))?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

This is of the form ((a+b)(a-b)=a-2-b-2).

Step 2

Why this answer is correct

(42-\(\sqrt{7}\)2=16-7=9).

Step 3

Exam Tip

In conjugate multiplication, directly use the difference of squares. चरण 1: यह ((a+b)(a-b)=a-2-b-2) का रूप है। चरण 2: (42-\(\sqrt{7}\)2=16-7=9)। चरण 3: संयुग्म गुणन में वर्गों का अंतर सीधे लगाएं।

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Question Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

(\left\(3+\sqrt{5}\right\)\left\(3-\sqrt{5}\right\)) का मान क्या है?

What is the value of (\left\(3+\sqrt{5}\right\)\left\(3-\sqrt{5}\right\))?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

This is of the form ((a+b)(a-b)=a-2-b-2).

Step 2

Why this answer is correct

(32-\(\sqrt{5}\)2=9-5=4).

Step 3

Exam Tip

In conjugate multiplication, directly use difference of squares. चरण 1: यह ((a+b)(a-b)=a-2-b-2) का रूप है। चरण 2: (32-\(\sqrt{5}\)2=9-5=4)। चरण 3: संयुग्म गुणन में वर्गों का अंतर सीधे लगाएं।

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Question Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

(\left\(2+\sqrt{3}\right\)\left\(2-\sqrt{3}\right\)) का मान क्या है?

What is the value of (\left\(2+\sqrt{3}\right\)\left\(2-\sqrt{3}\right\))?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

This is of the form ((a+b)(a-b)=a-2-b-2).

Step 2

Why this answer is correct

(22-\(\sqrt{3}\)2=4-3=1).

Step 3

Exam Tip

For conjugate products, difference of squares gives the answer quickly. चरण 1: यह ((a+b)(a-b)=a-2-b-2) का रूप है। चरण 2: (22-\(\sqrt{3}\)2=4-3=1)। चरण 3: संयुग्म रूप वाले गुणन में वर्गों का अंतर जल्दी उत्तर देता है।

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