Here's the question you clicked on:
Stropius
How do you factor this problem? x^2+4x+4-y^2 Thank you.
Normaly, you would try to write it as (x+a)² -(y+b)². Here: there is just a lone y², so we have no business with that one. Now you just have to factor x²+4x+4, which is (x+a)², with a real easy a...
Thank you very much for the help. I understand it now.