Question

If ab = - 4, find the value of (a - b)2 – (a + b)2​

Answer 1

Answer:

16

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Answer 2

Solution:- As We Know

(a+b)^2 = a^2+b^2+2ab

(a-b)^2 = a^2+b^2-2ab

So, (a+b)^2- (a-b)^2 = (a^2+b^2+2ab) - (a^2+ b^2-2ab)

a^2+b^2+2ab-a^2-b^2+2ab = 4ab

(a+b)^2-(a-b)^2=4ab