Q. 1 E5.0( 1 Vote )

Choose the correct answer for the following:

(a + b)2 – (a – b)2 = ________
A. 4ab

B. 2ab

C. a2 + 2ab + b2

D. 2(a2 + b2)

Answer :

We know that


(a– b)2 = a2 + b2 – 2a×b


and (a+ b)2 = a2 + b2 + 2a×b


(a+ b)2 – (a– b)2 = (a2 + b2 + 2a×b) – (a2 + b2 – 2a×b)


(a+ b)2 – (a– b)2 = 4ab

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