25(X-Y)^2+10(x-y)+1?

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25(X-Y)^2+10(x-y)+1?

25(X-Y)^2+10(x-y)+1
=[5(X-Y)]²+10(x-y)+1
=(5x-5Y+1)²

25(X-Y)²+10(x-y)+1
=[5(x-y)]²+10(x-y)+1²
=(5x-5y+1)²