SOLUTION: Factor the expression. x(x - y - z) + y(x - y - z) need help please.

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Question 272359: Factor the expression.
x(x - y - z) + y(x - y - z) need help please.
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
x(x - y - z) + y(x - y - z)
=x^2-yx-zx+yx-y^2-zy
=x^2-y^2-z(x+y)
.
Ed