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4ab MCQ Questions for Class 9

4ab se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

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5 questions tagged with 4ab.

Question 1/5 Hard Mathematics Exploring Algebraic Identities Algebraic identities Class 9 Level 64

( (a+b)2-(a-b)2 ) को (8) के बराबर दिया गया है। यदि (a=2) है तो (b) क्या होगा?

( (a+b)2-(a-b)2 ) is given equal to (8). If (a=2), what is (b)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

By identity the result is (4ab). \(4\cdot2\cdot b=8\), so (b=1).

Step 2

Why this answer is correct

The correct answer is A. (1). By identity the result is (4ab). \(4\cdot2\cdot b=8\), so (b=1).

Step 3

Exam Tip

पहचान से परिणाम (4ab) है। \(4\cdot2\cdot b=8\), इसलिए (b=1) है।

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Question 2/5 Medium Mathematics Exploring Algebraic Identities Algebraic identities Class 9 Level 63

( (2x+3y)2-(2x-3y)2 ) का सरल रूप क्या है?

What is the simplified form of ( (2x+3y)2-(2x-3y)2 )?

Explanation opens after your attempt
Correct Answer

B. (24xy)

Step 1

Concept

This is ( (a+b)2-(a-b)2=4ab ), where (a=2x) and (b=3y). So it gives (24xy).

Step 2

Why this answer is correct

The correct answer is B. (24xy). This is ( (a+b)2-(a-b)2=4ab ), where (a=2x) and (b=3y). So it gives (24xy).

Step 3

Exam Tip

यह ( (a+b)2-(a-b)2=4ab ) है जहाँ (a=2x) और (b=3y) है। इसलिए (24xy) मिलता है।

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Question 3/5 Medium Mathematics Exploring Algebraic Identities Algebraic identities Class 9 Level 63

( (x+5)2-(x-5)2 ) का सरल रूप क्या है?

What is the simplified form of ( (x+5)2-(x-5)2 )?

Explanation opens after your attempt
Correct Answer

C. (20x)

Step 1

Concept

( (a+b)2-(a-b)2=4ab ). Here (a=x) and (b=5), so the result is (20x).

Step 2

Why this answer is correct

The correct answer is C. (20x). ( (a+b)2-(a-b)2=4ab ). Here (a=x) and (b=5), so the result is (20x).

Step 3

Exam Tip

( (a+b)2-(a-b)2=4ab ) है। यहाँ (a=x) और (b=5) इसलिए (20x) मिलेगा।

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Question 4/5 Easy Mathematics Exploring Algebraic Identities Algebraic identities Class 9 Level 66

( (x+4)2-(x-4)2 ) का सरल रूप क्या है?

What is the simplified form of ( (x+4)2-(x-4)2 )?

Explanation opens after your attempt
Correct Answer

C. (16x)

Step 1

Concept

( (a+b)2-(a-b)2=4ab ). Here (a=x), (b=4), so it is (16x).

Step 2

Why this answer is correct

The correct answer is C. (16x). ( (a+b)2-(a-b)2=4ab ). Here (a=x), (b=4), so it is (16x).

Step 3

Exam Tip

( (a+b)2-(a-b)2=4ab ) है। यहाँ (a=x), (b=4), इसलिए (16x) है।

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Question 5/5 Easy Mathematics Exploring Algebraic Identities Algebraic identities Class 9 Level 65

( (a+b)2-(a-b)2 ) का सरल रूप क्या है?

What is the simplified form of ( (a+b)2-(a-b)2 )?

Explanation opens after your attempt
Correct Answer

B. (4ab)

Step 1

Concept

After subtracting both expansions, (4ab) remains. Exam tip: expand first and cancel like terms.

Step 2

Why this answer is correct

The correct answer is B. (4ab). After subtracting both expansions, (4ab) remains. Exam tip: expand first and cancel like terms.

Step 3

Exam Tip

दोनों विस्तार घटाने पर (4ab) बचता है। परीक्षा में पहले विस्तार करके समान पद काटें।

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