Question 949715
You need to study and understand what is in THIS link.
<a href="http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">INCLUDES How to Complete the Square</a>


Also understand the concept as discussed here:
<a href="http://www.algebra.com/my/Completing-the-Square-Using-Pictures.lesson?content_action=show_dev">Shows what completing the square means</a>