(a+b)³ - 3ab (a+b)
factorise with solution
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Answer:
(a+b)³-3ab(a+b)
a³+3a²b+3ab²+b³-3ab(a+b)
a³+3a²b+3ab²+b³-3a²b-3ab²
a³+3a²b-3a²b+3ab²-3ab²+b³
=a³+b³
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