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10 results found for "surd square" in Class 10.

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

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

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

यदि \(x=\sqrt{2}+\sqrt{3}\), तो \(x^2-2\sqrt{6}\) का मान क्या है?

If \(x=\sqrt{2}+\sqrt{3}\), what is the value of \(x^2-2\sqrt{6}\)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

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

Step 2

Why this answer is correct

Subtracting \(2\sqrt{6}\) leaves (5).

Step 3

Exam Tip

After squaring, cancel like irrational terms. चरण 1: (x-2=\(\sqrt{2}+\sqrt{3}\)2=5+2\sqrt{6})। चरण 2: इसमें से \(2\sqrt{6}\) घटाने पर (5) बचता है। चरण 3: वर्ग करने के बाद समान अपरिमेय पदों को काटें।

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

यदि \(x=\sqrt{11}+\sqrt{7}\), तो \(x^2-18\) का मान क्या है?

If \(x=\sqrt{11}+\sqrt{7}\), what is the value of \(x^2-18\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{77}\)

Step 1

Concept

\(x^2=11+7+2\sqrt{77}=18+2\sqrt{77}\).

Step 2

Why this answer is correct

Therefore \(x^2-18=2\sqrt{77}\), which is irrational.

Step 3

Exam Tip

In the square of a sum of different surds, the middle term is the key. चरण 1: \(x^2=11+7+2\sqrt{77}=18+2\sqrt{77}\)। चरण 2: इसलिए \(x^2-18=2\sqrt{77}\), जो अपरिमेय है। चरण 3: दो अलग मूलों के योग का वर्ग करते समय बीच वाला पद मुख्य होता है।

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

यदि \(a=7+4\sqrt{3}\), तो कौन-सा विकल्प (a) का वर्गमूल दर्शाता है?

If \(a=7+4\sqrt{3}\), which option represents a square root of (a)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

(\(2+\sqrt{3}\)2=4+4\sqrt{3}+3).

Step 2

Why this answer is correct

This equals \(7+4\sqrt{3}\).

Step 3

Exam Tip

In such questions, identify the form \(m+n+2\sqrt{mn}\). चरण 1: (\(2+\sqrt{3}\)2=4+4\sqrt{3}+3)। चरण 2: यह \(7+4\sqrt{3}\) के बराबर है। चरण 3: ऐसे प्रश्नों में \(m+n+2\sqrt{mn}\) का रूप पहचानें।

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

यदि \(x=\sqrt{2}+\sqrt{7}\), तो \(x^2-9\) का मान क्या है?

If \(x=\sqrt{2}+\sqrt{7}\), what is the value of \(x^2-9\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{14}\)

Step 1

Concept

\(x^2=2+7+2\sqrt{14}=9+2\sqrt{14}\).

Step 2

Why this answer is correct

Therefore \(x^2-9=2\sqrt{14}\), which is irrational.

Step 3

Exam Tip

Square first, then subtract the rational part. चरण 1: \(x^2=2+7+2\sqrt{14}=9+2\sqrt{14}\)। चरण 2: इसलिए \(x^2-9=2\sqrt{14}\), जो अपरिमेय है। चरण 3: पहले वर्ग करें, फिर परिमेय भाग घटाएँ।

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

कौन-सा विकल्प \(5+2\sqrt{6}\) के बराबर है?

Which option is equal to \(5+2\sqrt{6}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

(\(\sqrt{3}+\sqrt{2}\)2=3+2+2\sqrt{6}).

Step 2

Why this answer is correct

This equals \(5+2\sqrt{6}\).

Step 3

Exam Tip

When squaring a sum of two surds, the middle term becomes \(2\sqrt{6}\). चरण 1: (\(\sqrt{3}+\sqrt{2}\)2=3+2+2\sqrt{6})। चरण 2: यह \(5+2\sqrt{6}\) के बराबर है। चरण 3: दो मूलों के योग का वर्ग करते समय बीच वाला पद \(2\sqrt{6}\) बनता है।

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

यदि \(x=\sqrt{7}+\sqrt{28}\), तो \(\frac{x^2}{7}\) का मान क्या है?

If \(x=\sqrt{7}+\sqrt{28}\), what is the value of \(\frac{x^2}{7}\)?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

\(\sqrt{28}=2\sqrt{7}\), so \(x=3\sqrt{7}\).

Step 2

Why this answer is correct

(x-2=\(3\sqrt{7}\)2=63), hence \(\frac{x^2}{7}=9\).

Step 3

Exam Tip

Combine like surds before squaring. चरण 1: \(\sqrt{28}=2\sqrt{7}\), इसलिए \(x=3\sqrt{7}\)। चरण 2: (x-2=\(3\sqrt{7}\)2=63), अतः \(\frac{x^2}{7}=9\)। चरण 3: वर्ग करने से पहले समान मूल वाले पद जोड़ना सरल रहता है।

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

यदि \(x=\sqrt{5}+\sqrt{20}\), तो \(x^2\) का मान क्या है?

If \(x=\sqrt{5}+\sqrt{20}\), what is the value of \(x^2\)?

Explanation opens after your attempt
Correct Answer

B. (45)

Step 1

Concept

\(\sqrt{20}=2\sqrt{5}\), so \(x=3\sqrt{5}\).

Step 2

Why this answer is correct

(x-2=\(3\sqrt{5}\)2=9\times5=45).

Step 3

Exam Tip

Simplify surd terms before squaring. चरण 1: \(\sqrt{20}=2\sqrt{5}\), इसलिए \(x=3\sqrt{5}\)। चरण 2: (x-2=\(3\sqrt{5}\)2=9\times5=45)। चरण 3: वर्ग करने से पहले मूल वाले पदों को सरल करें।

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

यदि \(x=\sqrt{2}+\sqrt{3}\), तो \(x^2\) के बारे में सही कथन क्या है?

If \(x=\sqrt{2}+\sqrt{3}\), which statement about \(x^2\) is correct?

Explanation opens after your attempt
Correct Answer

A. \(x^2=5+2\sqrt{6}\), अपरिमेय\(x^2=5+2\sqrt{6}\), irrational

Step 1

Concept

Use ((a+b)2=a-2+2ab+b-2).

Step 2

Why this answer is correct

\(x^2=2+2\sqrt{6}+3=5+2\sqrt{6}\), which has an irrational part.

Step 3

Exam Tip

Do not forget the middle term when squaring a sum of surds. चरण 1: ((a+b)2=a-2+2ab+b-2) का प्रयोग करें। चरण 2: \(x^2=2+2\sqrt{6}+3=5+2\sqrt{6}\), जिसमें अपरिमेय भाग है। चरण 3: दो मूलों के योग का वर्ग करते समय बीच वाला पद न भूलें।

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