If you are like most of America and are having trouble understanding how to "Complete the Square", then check out this video. It gives a step-by-step process, showing where everything comes from. Also, the lesson leads up to finding the quadratic formula, which is one of the major reasons why completing the square is so useful. The lesson touches at the end on the quadratic formula and how it is used. A great lesson for learning what it means to complete the square.