Khan/khan-exercises — pull request #10830 by danielmclaury (2012-01-10 08:55:08+00:00)
Title: New Exercise: Factor expressions by grouping

This is my first try at writing an exercise, so let me know if I've done anything wrong. I've made an exercise to go with the video http://www.khanacademy.org/video/factor-expressions-by-grouping here.