Question:
The value of (a + b)2 – (a – b)2 is
(a) 4ab
(b) – 4ab
(c) 2a2 + 2b2
(d) 2a2 – 2b2
Solution:
(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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