Intro to Quadratic Formula

This is another way to find solutions to a quadratic eq.

Check out this musical about the Quadratic formula

"Quadratic Formula"
A nerdy Parody of Adele's "Rolling in the Deep"
Based on the version written by high school teachers Emily Helf and Carey Blalock at Sequoyah High School in GA. (with some changes)
Quadratic Formula - the Musical

The most popular Quadratic Formula song on the planet!!!

Be prepared to have this song stuck in your head the rest of the day!
Quadratic Formula Song Rockford Christian

Here's a quick example of the math behind the quadratic formula...

Teaching the Quadratic Formula

Now let's go through the notes so you can get some practice

There are more than one method to solve quadratic equations (find zeros/roots/x-intercepts). We have learned the following so far:

· ________________________________

· ________________________________

· ________________________________

We can also use quadratic formula to solve a quadratic function.

Standard form a + bx + c = 0 is required to use the formula.




x = AND x =

OR just use x =

Examples: Solving the quadratic function by using the quadratic formula.

1. x2 – 9x + 20 = 0

a =

b =

c =

x = ________ & x = _________