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difference of areas MCQ Questions for Class 9

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Question 1/1 Expert Mathematics Exploring Algebraic Identities Visual models of identities Class 9 Level 68

एक (x+2) भुजा वाले वर्ग और (x-2) भुजा वाले वर्ग के क्षेत्रफलों का अंतर दृश्य रूप से चार पट्टियों में दिखता है। कुल अंतर क्या होगा?

The difference of areas of squares with sides (x+2) and (x-2) is shown visually by four strips. What is the total difference?

Explanation opens after your attempt
Correct Answer

B. (8x)

Step 1

Concept

((x+2)2-(x-2)2=8x). Exam tip: use ((a+b)2-(a-b)2=4ab).

Step 2

Why this answer is correct

The correct answer is B. (8x). ((x+2)2-(x-2)2=8x). Exam tip: use ((a+b)2-(a-b)2=4ab).

Step 3

Exam Tip

((x+2)2-(x-2)2=8x) होता है। परीक्षा में ((a+b)2-(a-b)2=4ab) लगाएं।

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