a(a+b)³-3a²b(a+b) : Factorise
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Step-by-step explanation:
a(a+b)3-3a2b(a+b) = a{a3+b3+3ab(a+b)}-3a2b(a+b) = a4+ab3+3a2b(a+b)-3a2b(a+b) = a4+ab3 = a(a3+b3)
= a{(a+b)(a2+b2-ab)} = a(a+b)(a2+b2-ab).
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That is the answer hopefully. ✌
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