# Math Help - How on earth do I factor with two variables?

1. ## How on earth do I factor with two variables?

Hi how do I factor 7x-35y^2

Hi how do I factor 7x-35y^2
This is the difference between two squares:

$a^2-b^2$

This factors as $a^2-b^2=(a+b)(a-b)$

In your problem, we have $7x-35y^2$

Thus, $a=\sqrt{7x}$ and $b=\sqrt{35}y$

Plug this into the formula I gave you and see what you get.

Does this make sense?

--Chris