# How do you solve #-7= - 3z ^ { 2} + 9z# using the quadratic formula?

##### 1 Answer

Nov 21, 2017

#### Explanation:

The first thing we want to do is set one side to be 0, so let's move everything to the left side of the equation.

This equation is now written in standard quadratic form, or

Now we can use the quadratic formula. The quadratic formula is

We know that