How do you factor this one expression?
I'm really good at factoring I believe, but for the life of me, I can't figure this one out....
X^2-6x+9-4y^2
How do you do it? There is x and y terms... what do I do?...
February 28, 2013
2 Comments • Newest first
[quote=PoetryIsMeh](x^2-6x+9) - (4y^2)
Break down the first half of it
(x-3)^2 - (4y^2)
Break down second half of it
(x-3)^2 - (2y)^2
Difference of two squares
(x-3+2y)(x-3-2y)[/quote]
I understand it all but the last bit.
How is there a difference of two squares? U broke down a 4y^2 to - (2y)^2.
How does that become a +2y and a -2y?
69
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