Please check out this PowerPoint lesson preview! This is one of my favorite complete 2-day lessons that I created years ago and have perfected. Some of the slides have 30+ animations to best teach the steps to factoring using the XBOX. Although the animations are numerous, they are not confusing or overwhelming. I have had the best success teaching factoring by using this resource.
When I was a student, the guess and check method of factoring was tedious and frustrating at times. The XBOX method (that an unknown genius out there created) helps students organize their thoughts and eliminates the need to guess and check on the most complicated problems, even when the coefficient of x^2 doesn't equal 1.
The preview PowerPoint show highlights the strategies taught in this complete 2+ day lesson for you and your students.
Additionally, the guided notes page that I created to accompany this ppt is located at: http://www.teacherspayteachers.com/Product/Factoring-Quadratic-Trinomials-Using-the-XBOX-Method-Guided-Notes