How do you factor $- 9 - x^{2} - 2 x y + y^{2}$ $-9-x^2-2xy+y^2$ ?

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Answer 1 · 2016-01-27T16:28:10

$- 9 + (x - y) (- x - y)$ $-9 + (x-y)(-x-y)$

The terms $- x^{2} - 2 x y + y^{2}$ $-x^2-2xy+y^2$ is equal to $(x - y) (- x - y)$ $(x-y)(-x-y)$ .

How do you factor -9-x^2-2xy+y^2−9−x2−2xy+y2-9-x^2-2xy+y^2?