Question 906168
Question Number 906170 is much like this one.  See that solution as an instructive example.


Also check this lesson for Completing The Square to put a quadratic equation into vertex form  (standard form):
<a href="http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">Completing the Square to Solve General Quadratic Equation  - http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev</a>