solve 8×(a + b )³- ( a - b)³
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8(a+b)³ - (a-b)³
= (2)³ × (a+b)³ - (a-b)³
= (2a+2b)³ - (a-b)³
since, a³-b³ = (a-b)(a²+ab+b²)
= {(2a+2b)-(a-b)}(4a²+8ab+4b²+2a²-2ab+2ab-2b²+a²-2ab+b²)
= (a+3b)(7a²+6ab+3b²)
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