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