4ab এর সঠিক প্রয়োগ কোনটি?

A (a+b)2 – (a-b)2

B (a-b)2 – (a+b)2

C {(a+b)2/2} + {(a-b)2/2}

D (a+b)2/2 - (a-b)2/2

Solution

Correct Answer: Option A

ab = {(a+b)2/2} - {(a-b)2/2}

4ab = (a+b)2 – (a-b)2

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