You may want to review the Quadratic Formula first.

If the equation has other variables, that's okay; you can still
solve for one variable using the Quadratic Formula (or any other
method, if you can find one that works). The answer will have the
other variable in it. For example, suppose you have to solve
3*x*^{2} − 4*y*^{2} −
2*x* = 0 for *y*. You can rewrite this as
4*y*^{2} = 3*x*^{2} −
2*x*. The solutions are then −1 ⁄ 2
* √(3*x*^{2} − 2*x*) and
1 ⁄ 2 * √(3*x*^{2} −
2*x*).