Sumplify (a+b)³ - (a-b)³ - 6b (a²-b²)
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Step-by-step explanation:
(a+b)³-(a-b)³-6b(a²-b²)
=a³+b³+3ab(a+b)-[a³-b³-3ab(a-b)]-6(a²-b)²
=a³+b³+3ab(a+b)-a³+b³+3ab(a-b)-6(a²-b²)
=2b³+3a²b+3ab²+3a²b-3ab²-6(a+b)(a-b)
=2b³+6a²b-6(a+b)(a-b)
hope this helps you
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