## The Quadratic Formula

A quadratic equation is an equation of the form ax² + bx + c = 0, where a . we can solve equations of this form by identifying a, b and c and substituting them into the formulato find.

Example: Solve

Then or

It is very important to get the correct values of,, and. For the following equations the values are given

Notice that if a minus sign appears in the formula we have to solve then that value of, or will be negative.

Then for the first equation

We may also solve quadratic equations by sketching a quadratic graph or by completing the square.

Example:Solve

Thenor