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