Completing the Square with Area Models

Demonstrating the method of completing the square using a four-area model. This is useful for converting quadratic functions from standard form to vertex form.

[ktybrian]

There's an error on example 3 with the -1. If you're going to double the (x+1)^2 then the -1 to make a zero pair also needs to be doubled.

[mr.bengergen]

Also an error on example 4: 100-27=73, not 77