16-8(x-y)+(x-y)^2
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16-8(x-y)+(x-y)^216-8(x-y)+(x-y)^216-8(x-y)+(x-y)^216-8(x-y)+(x-y)^2=(x-y)^2-8(x-y)+16=(x-y-4)^2
16-8(x-y)+(x-y)^2
16-8(x-y)+(x-y)^2
16-8(x-y)+(x-y)^2
16-8(x-y)+(x-y)^2
=(x-y)^2-8(x-y)+16
=(x-y-4)^2
(x-2y)²+16y-8x+16
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