Question

subtract
$x {}^{2} + y - 2xyfrom \: x {}^{2} + y {}^{2} + 2xy$
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Answer 1

Answer:

${x}^{2} + {y}^{2} + 2xy - ( {x}^{2} + {y}^{2} - 2xy) \\ = {x}^{2} + {y}^{2} + 2xy - {x}^{2} - {y}^{2} + 2xy \\ = 2xy + 2xy = 4xy$

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