Posted by **Mae** on Thursday, October 9, 2008 at 10:19pm.

hi, could someone please explain how to factor this?

3x^2-2xy-y^2

- Gr.11 Factoring -
**DrBob222**, Thursday, October 9, 2008 at 10:46pm
Start with the parentheses.

( )( )

The only way we can obtain 3x^2 is with 3x and x so put those in first. The only way we can get the last term is y and y so put those in next. The only way we can get a - term for the y^2 to to have one sign with the parentheses + and the other -. Just place them so the middle term is -2xy.

(3x+y)(x-y). User the FOIL method to check it. 3x^2 -3xy + xy -y^2 =

3x^2-2xy-y^2

Check my work.

- Gr.11 Factoring -
**Mae**, Thursday, October 9, 2008 at 11:24pm
thanks so much! i finally understand it

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