How to factorize (a+b)³ - 8
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(a+b)³-8=(a+b)³-2³
=(a+b-2)[(a+b)²+2(a+b)+4]
=(a+b-2)(a²+b²+2ab+2a+2b+4)
=(a+b-2)(a²+b²+2(ab+a+b)+4)
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