Question

subtract the sum of 2x2 + 5xy - y2 and -3x2 - xy + 2y2 from x2 + 4xy + y2​

Answer 1

$2 {x}^{2} + 5xy - {y}^{2} + ( - 3 {x}^{2} - xy + 2 {y}^{2} ) </p><p>= - {x}^{2} + 4xy + {y }^{2} \\ - {x}^{2} + 4xy + {y }^{2} - ( {x}^{2} + 4xy + {y}^{2} ) = - 2 {x}^{2} \\ \\ therefore \: we \: have \: - 2 {x}^{2}$

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