There are three applets in this Geogebra book:
Factoring 1: Factoring quadratic expressions with a lead coefficient of a = 1
Factoring 2: Factoring quadratic expressions with a lead coefficient of a <> 1
Factoring 3: Completing the Square
Factoring 1, Factoring 2, and Completing the Square include a Steps slider which shows you the steps involved in factoring each expression. Hitting the refresh button will bring up a newly randomized problem.
