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The value of (a + b)^2 – (a – b)^2 is

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The value of (a + b)2 – (a – b)2 is

(a) 4ab (b) – 4ab (c) 2a2 + 2b2 (d) 2a2 – 2b2

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(a) 4ab

The value of (a + b)2 – (a – b)2 

= (a2 + b2 + 2ab) – (a2 + b2 – 2ab)

= a2 – a2 + b2 – b2 + 2ab + 2ab

= 4ab

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