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Mathematics Algebraic identities MCQ Questions for Class 9

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Algebraic identities Practice Questions

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पहचान ( (a+b)2 ) का सही विस्तार क्या है?

What is the correct expansion of the identity ( (a+b)2 )?

Explanation opens after your attempt
Correct Answer

B. \(a^2+2ab+b^2\)correct expansion

Step 1

Concept

In ( (a+b)2 ), the middle term is (2ab). Exam tip: do not forget the middle term in square identities.

Step 2

Why this answer is correct

The correct answer is B. \(a^2+2ab+b^2\) / correct expansion. In ( (a+b)2 ), the middle term is (2ab). Exam tip: do not forget the middle term in square identities.

Step 3

Exam Tip

( (a+b)2 ) में बीच का पद (2ab) आता है। परीक्षा में वर्ग पहचान में मध्य पद न भूलें।

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पहचान ( (x-y)2 ) का सही विस्तार चुनिए।

Choose the correct expansion of the identity ( (x-y)2 ).

Explanation opens after your attempt
Correct Answer

C. \(x^2-2xy+y^2\)correct expansion

Step 1

Concept

In ( (x-y)2 ), the middle term is (-2xy). Exam tip: pay attention to the negative sign.

Step 2

Why this answer is correct

The correct answer is C. \(x^2-2xy+y^2\) / correct expansion. In ( (x-y)2 ), the middle term is (-2xy). Exam tip: pay attention to the negative sign.

Step 3

Exam Tip

( (x-y)2 ) में बीच का पद (-2xy) होता है। परीक्षा में ऋण चिह्न पर ध्यान दें।

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पहचान ( (p+q)(p-q) ) किसके बराबर होती है?

The identity ( (p+q)(p-q) ) is equal to what?

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Correct Answer

A. \(p^2-q^2\)difference of squares

Step 1

Concept

( (p+q)(p-q)=p-2-q-2 ). Exam tip: remember it as difference of squares.

Step 2

Why this answer is correct

The correct answer is A. \(p^2-q^2\) / difference of squares. ( (p+q)(p-q)=p-2-q-2 ). Exam tip: remember it as difference of squares.

Step 3

Exam Tip

( (p+q)(p-q)=p-2-q-2 ) होता है। परीक्षा में इसे वर्गों का अंतर याद रखें।

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( (m+n)2 ) में (2mn) को क्या कहा जा सकता है?

In ( (m+n)2 ), what can (2mn) be called?

Explanation opens after your attempt
Correct Answer

D. मध्य पदmiddle term

Step 1

Concept

In ( (m+n)2=m-2+2mn+n-2 ), (2mn) is the middle term. Exam tip: identify all three terms.

Step 2

Why this answer is correct

The correct answer is D. मध्य पद / middle term. In ( (m+n)2=m-2+2mn+n-2 ), (2mn) is the middle term. Exam tip: identify all three terms.

Step 3

Exam Tip

( (m+n)2=m-2+2mn+n-2 ) में (2mn) मध्य पद है। परीक्षा में तीन पदों की पहचान करें।

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( (7+3)2 ) को पहचान से निकालने पर मान क्या होगा?

Using an identity, what is the value of ( (7+3)2 )?

Explanation opens after your attempt
Correct Answer

B. (100)

Step 1

Concept

( (7+3)2=102=100 ). Exam tip: identities make mental calculation faster.

Step 2

Why this answer is correct

The correct answer is B. (100). ( (7+3)2=102=100 ). Exam tip: identities make mental calculation faster.

Step 3

Exam Tip

( (7+3)2=102=100 ) होता है। परीक्षा में पहचान से मानसिक गणना तेज होती है।

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( (10-2)2 ) का मान कौन-सा है?

What is the value of ( (10-2)2 )?

Explanation opens after your attempt
Correct Answer

C. (64)

Step 1

Concept

( (10-2)2=82=64 ). Exam tip: first find the value inside the bracket.

Step 2

Why this answer is correct

The correct answer is C. (64). ( (10-2)2=82=64 ). Exam tip: first find the value inside the bracket.

Step 3

Exam Tip

( (10-2)2=82=64 ) होता है। परीक्षा में पहले कोष्ठक का मान निकालें।

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\( 15^2-5^2 \) को किस पहचान से सरल किया जा सकता है?

Which identity can simplify \( 15^2-5^2 \)?

Explanation opens after your attempt
Correct Answer

D. (a-2-b-2=(a+b)(a-b))

Step 1

Concept

This is the form \(a^2-b^2\). Exam tip: convert difference of squares into a product.

Step 2

Why this answer is correct

The correct answer is D. (a-2-b-2=(a+b)(a-b)). This is the form \(a^2-b^2\). Exam tip: convert difference of squares into a product.

Step 3

Exam Tip

यह \(a^2-b^2\) का रूप है। परीक्षा में वर्गों के अंतर को गुणनफल में बदलें।

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( (x+4)2 ) का विस्तार क्या होगा?

What is the expansion of ( (x+4)2 )?

Explanation opens after your attempt
Correct Answer

A. \(x^2+8x+16\)

Step 1

Concept

( (x+4)2=x-2+2\cdot x\cdot4+16=x-2+8x+16 ). Exam tip: use (2ab).

Step 2

Why this answer is correct

The correct answer is A. \(x^2+8x+16\). ( (x+4)2=x-2+2\cdot x\cdot4+16=x-2+8x+16 ). Exam tip: use (2ab).

Step 3

Exam Tip

( (x+4)2=x-2+2\cdot x\cdot4+16=x-2+8x+16 )। परीक्षा में (2ab) लगाएँ।

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( (y-5)2 ) का सही विस्तार चुनिए।

Choose the correct expansion of ( (y-5)2 ).

Explanation opens after your attempt
Correct Answer

B. \(y^2-10y+25\)

Step 1

Concept

( (y-5)2=y-2-10y+25 ). Exam tip: keep the sign of the middle term correct.

Step 2

Why this answer is correct

The correct answer is B. \(y^2-10y+25\). ( (y-5)2=y-2-10y+25 ). Exam tip: keep the sign of the middle term correct.

Step 3

Exam Tip

( (y-5)2=y-2-10y+25 ) होता है। परीक्षा में मध्य पद का चिह्न सही रखें।

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( (3a+2b)2 ) में मध्य पद क्या है?

What is the middle term in ( (3a+2b)2 )?

Explanation opens after your attempt
Correct Answer

C. (12ab)

Step 1

Concept

The middle term is \(2\cdot3a\cdot2b=12ab\). Exam tip: multiply both terms and then multiply by (2).

Step 2

Why this answer is correct

The correct answer is C. (12ab). The middle term is \(2\cdot3a\cdot2b=12ab\). Exam tip: multiply both terms and then multiply by (2).

Step 3

Exam Tip

मध्य पद \(2\cdot3a\cdot2b=12ab\) है। परीक्षा में दोनों पदों को गुणा करके (2) से गुणा करें।

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Algebraic identities FAQs

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