First, please create an account

Already have a Sophia account?

Solving Quadratic Equations by Completing the Square

Author: Shirley Beil

The following video is being made available with closed captioning at:

http://youtu.be/x6JnGycFLP0

x^2 − 9x + 1 = 0

The following video is being made available with closed captioning at:

http://youtu.be/YAxJyffi_sg

4x^2 − 16x + 13 = 0

At 3:17 into this video I lost the square root sign on the 3 when formulating the final answer! The final answers should have been x = 2 +/- (sqrt 3)/2 which could also have been written x=(4 +/-(sqrt 3))/2.