Question 869016
This should help to understand what to do:


<a href="http://www.algebra.com/tutors/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">Completing the Square to Solve General Quadratic Equation </a>


The term to use for Completing the Square is {{{(-10/2)^2=25}}}.  Your equation is simpler than if your coefficient on {{{x^2}}} were something other than 1.