Completing the Square

Completing the Square

This website show you how to do it in a "cheating way"

http://www.purplemath.com/modules/sqrquad.htm

Turning Point

When you completed a square you usually have this kind of format

${(x + a)^2} + b = 0$

The turning point is the minimum value so it is like this

$( - a,b)$