(x+y)²(x-y)+(x+y)(x-y)²

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(x+y)²(x-y)+(x+y)(x-y)²
(x+y)²(x-y)+(x+y)(x-y)²

(x+y)²(x-y)+(x+y)(x-y)²
(x+y)²(x-y)+(x+y)(x-y)²
=(x+y)(x-y)(x+y+x-y)
=(x+y)(x-y)*2x
=2x*(x+y)(x-y)

。。。