First, the standard form of a quadratic equation is

                                  ax2 + bx + c = 0                          a ≠ 0

Here the only needs are that we have an x² in the equation. We guarantee that this term will be exist in the equation by needing a ≠ 0 .  However, Note that it is okay if b and/or c are zero.

There are several ways to solve quadratic equations. The first two methods won't always work, yet are possibly a little simpler to use while they work.  In This section we will cover with these two methods.