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