francesca-bailey_60bc0041aabf3
francesca-bailey_60bc0041aabf3
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x^2 + 4xy + 4y^2 = x^2 + 2xy + 2xy + 4y^2 = x(x + 2y) + 2y(x + 2y) = (x + 2y)(x + 2y) = (x + 2y)^2