Q1 of 157 Page 22

Choose the correct answer for the following:

(a + b)2 – (a – b)2 = ________

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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