4-12(x-y)+9(x-y)²=?

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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=?
4-12(x-y)+9(x-y)²=?

4-12(x-y)+9(x-y)²=?