Khan/khan-exercises — pull request #15071 by beneater (2012-03-01 03:19:56+00:00)
Title: Add exercise: Solving quadratics by taking the square root

Easier exercise to serve as a prereq for completing the square, etc.

http://sandcastle.khanacademy.org/media/castles/beneater:quadratic-sqrt/exercises/solving_quadratics_by_taking_the_square_root.html

@msuhendra @mwahl code review