4(x+y)^2-20(x-y)+25
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4(x+y)^2-20(x-y)+254(x+y)^2-20(x-y)+254(x+y)^2-20(x-y)+254(x+y)^2-20(x+y)+25=[2(x+y)-5]^2=(2x+2y-5)^
4(x+y)^2-20(x-y)+25
4(x+y)^2-20(x-y)+25
4(x+y)^2-20(x-y)+25
4(x+y)^2-20(x+y)+25
=[2(x+y)-5]^2
=(2x+2y-5)^5
4(x-y)^2-20(x-y)+25
=[2(x-y)-5]^2
=(2x-2y-5)^5
4(x+y)^2-20(x-y)+25
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4(x+y)²-20(x+y)+25
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