Question
Factor polynomial $$ 1-x^{2}-2xy-y^{2} $$
Answer
$$ 1-x^{2}-2xy-y^{2} = (x+y+1)(-x-y+1) $$
Explanation
$ 1-x^2-2xy-y^2 $ can be written as
$$ 1-x^2-2xy-y^2 = \left( x+y+1 \right) \left( -x-y+1 \right)$$The explanation for this step cannot be generated.
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