разложите на множители :2х-х в квадрате+у в квадрате +2у
2x - x^2 + y^2 + 2y = (y^2 - x^2) + 2(x+y) = (y+x)(y-x) + 2(y+x) = (y+x)(y-x+2)
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2x - x^2 + y^2 + 2y = (y^2 - x^2) + 2(x+y) = (y+x)(y-x) + 2(y+x) = (y+x)(y-x+2)