(x+y²)+9(x-y)²-6(x²-y²)

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(x+y²)+9(x-y)²-6(x²-y²)
(x+y²)+9(x-y)²-6(x²-y²)

(x+y²)+9(x-y)²-6(x²-y²)
(x+y)²+9(x-y)²-6(x²-y²)
=(x+y)²-2·(x+y)·[3(x-y)]+[3(x-y)]²
=[(x+y)-3(x-y)]²
=(x+y-3x+3y)²
=(-2x+4y)²
=4(x-2y)²