To complete the square the leading coefficient a a must equal 1. To complete the square the leading coefficient a a must equal 1. To solve a x 2 b x c 0 by completing the square.
Displaystyle ax2bxcax-h2kquad textwherequad h-frac b2aquad textandquad kc-ah2c-frac b24a.
In completing the square method we solve the quadratic equation of ax²bxc0 to become a form of a xh²k0. Write the equation in the form such that c is on the right side. Move the loose number over to the other side. We then apply the square root property.