You may want to review the basic idea of this and how to factor first.

Now that you know how to factor, you can solve quadratic
equations. If one side is 0, then just factor the other side; the
solutions are just the values of *x* which make at least one
factor 0. If neither side is 0, then you need to fix that. For
example, if you needed to solve *x*^{2} −
3*x* = −2, you could add 2 to both sides,
getting *x*^{2} − 3*x* + 2 = 0. Then you
can factor the left-hand side.

Sometimes the equation will be given to you with one or both
sides *already* factored. This is a big help *if*
the other side is 0. If not, though, it doesn't help you at all.
Multiply it out; then proceed as usual.

If one of the factors is a number, say 2, then just ignore it
(since 2 is never 0). For example, if you have 2(*x* +
2)(*x* − 3) = 0, the solutions are just −2 (from
the *x* + 2 factor) and 3 (from the *x* − 3
factor).