For information about completing the square, click on the link below, and type the quadratic equation in standard form in the f(x) box at the top of the page. Scroll down and choose iii "Completing the square" by selecting the GO button at the right. Scroll down to the bottom of the page for a full explanation of how the problem is solved. For information about the quadratic formula scroll down and choose ii "Using the quadratic formula" by selecting the GO button at the right. Scroll down to the bottom of the page for a full explanation of how the problem is solved.