3x-3y-x^2+y^2(adsbygoogle = window.adsbygoogle || []).push({});

My textbook says the answer is (3-x-y)(x-y)

I tried to factor it two different ways. One time I got

3(x-y)-x^2+y^2

And the other time I got

x(3-x)-y(3-y)

I've never seen a polynomial with 4 unlike terms like this before, and I am not understanding how 3-x-y is part of the answer (it has three terms in it). How does one go about factoring something like this?

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# Homework Help: How do I factor 3x-3y-x^2+y^2

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