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 x2 − 3x = −2, you could add 2 to both sides, getting x2 − 3x + 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).