x²-2xy+y²+3x-3y+2

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x²-2xy+y²+3x-3y+2x²-2xy+y²+3x-3y+2x²-2xy+y²+3x-3y+2x²-2xy+y²

x²-2xy+y²+3x-3y+2
x²-2xy+y²+3x-3y+2

x²-2xy+y²+3x-3y+2
x²-2xy+y²+3x-3y+2
=(x-y)^2+3(x-y)+2
=(x-y+2)(x-y+1)