Completing the Square, Algebra Topic

Our friend who teaches Ordinary Differential Equations ( a course taken after Calculus III) was visiting and lamented that some of his students had forgotten the Quadratic Formula from Algebra II. That is a formula, like the Pythagorean Theorem of geometry, no one in math forgets! That motivated me to upload a Quadratic Formula tutorial, but I have to lay some ground work first. So am working on a set of tutorials called Completing the Square.