What does completing the square mean?
Completing the square is a method that represents a quadratic equation as a combination of quadrilateral used to form a square.
The basis of this method is to discover a special value that when added to both sides of the quadratic that will create a perfect square trinomial.
That special value is found by evaluation the expression
A quadratic that is a perfect square is very easy to solve.
Please take a look at the video to see an example of completing the square visually.