2x-y)²-10(2x-y)+25(2x-y)²-10(2x-y)+25

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2x-y)²-10(2x-y)+25(2x-y)²-10(2x-y)+25

2x-y)²-10(2x-y)+25(2x-y)²-10(2x-y)+25
2x-y)²-10(2x-y)+25
(2x-y)²-10(2x-y)+25

2x-y)²-10(2x-y)+25(2x-y)²-10(2x-y)+25
﹙2x-y)²-10(2x-y)+25
=[(2x-y)-5]²
=(2x-y-5)²