4+12(x-y)+9(x-y)²

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4+12(x-y)+9(x-y)²
x)3y {:

4+12(x-y)+9(x-y)²
4+12(x-y)+9(x-y)²

4+12(x-y)+9(x-y)²
4+12(x-y)+9(x-y)²=[3(x-y)+2]²