## Quadratic equation:

Often, the simplest way to solve “*ax*^{2} + bx + c = 0″ for the value of x is to factor the quadratic, set each factor equal to zero, and then solve each factor. But sometimes the quadratic is too messy, or it doesn’t factor at all, or you just don’t feel like factoring. While factoring may not always be successful, the Quadratic Formula can always find the solution.

The Quadratic Formula uses the “a”, “b”, and “c” from “*ax*^{2} + bx + c”, where “a”, “b”, and “c” are just numbers; they are the “numerical coefficients” of the quadratic equation they’ve given you to solve.

The Quadratic Formula is derived from the process of completing the square, and is formally stated as:

The Quadratic Formula: For *ax*^{2} + *bx* + *c* = 0, the values of x which are the solutions of the equation are given by:

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