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X^{2} +16xy+63y ^{2}
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X^{2} +16xy+63y ^{2}

User Codii
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x^(2) +16xy+63y ^(2) \\ = x^(2) +16xy+64y ^(2)-y ^(2) \\ = (x+8y)^(2)-y ^(2) \\ =(x+8y+y)(x+8y-y) \\ =(x+9y)(x+7y)
User Narner
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