(a+b)whole cube- (a-b)whole cube
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(a+b)³-(a-b)³
(a+b-a+b)[(a+b)²+(a+b)(a-b) +(a-b) ²]
(2b) [a²+b²+2ab+a²-b²+a²-2ab+b²]
(2b) (3a²+b²)
(a+b-a+b)[(a+b)²+(a+b)(a-b) +(a-b) ²]
(2b) [a²+b²+2ab+a²-b²+a²-2ab+b²]
(2b) (3a²+b²)
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