Factorise a (a+b)^2 -2ab (a+b)
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a((a^2)+(2ab)+(b^2))-((2a^2b) - (2ab^2))
=((a^3) + (2a^2b) + (ab^2)) - ((2a^2b) - (2ab^2))
=((a^3) + (ab^2) - (2ab^2))
=a((a^2) + (b^2) - (2b^2))
=a(a^2 - b^2)
=((a^3) + (2a^2b) + (ab^2)) - ((2a^2b) - (2ab^2))
=((a^3) + (ab^2) - (2ab^2))
=a((a^2) + (b^2) - (2b^2))
=a(a^2 - b^2)
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