Question

(x2-y2+2xy+1)-(x2+y2+4xy-5)​

Answer 1

Answer:

$({x}^{2}-{y}^{2}+2xy+1)-({x}^{2}+{y}^{2}+4xy-5)$

$={x}^{2}-{y}^{2} + 2xy+1-{x}^{2}-{y}^{2}-4xy+5$

$= - 2 {y}^{2} - 2xy - 4$

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