Factorise: a(a+b)^2 - 2ab(a+b)
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a*(a+b)^2 - 2ab*(a+b)
= (a+b) *[a*(a+b) – 2ab]
= (a+b) *[a^2+ab-2ab]
= (a+b)*[a^2-ab]
= (a+b) * a * (a-b)
= a*(a+b)*(a-b) or a*(a^2-b^2)
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