Question 888774
Those are completely in symbols.  Only one coefficient is shown in a known real number other than the assumed 1.  


This lesson about completing the square is also completely in symbols.
<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 </a>