1. http://www.mathsisfun.com/algebra/factoring.html
2. http://www.veazeys.com/math/
3. http://www.algebrahelp.com/lessons/equations/solvebyfactoring/
4. http://www.algebralab.org/studyaids/studyaid.aspx?file=Algebra2_5-2.xml
2. http://www.youtube.com/watch?v=r_-oBuVpv38
3. http://www.youtube.com/watch?v=YFf7oDJp1pQ