Briefly review this page, which contains examples of applying the difference of two squares formula to all kind of binomials. Scroll down to the Practice Set, and complete exercises 14-23. Use the "Special Products of Binomials" video embedded in the text for guidance, if you need help. Once you have completed the practice problems, check your answers against the answer key.

Click http://www.ck12.org/book/Basic-Algebra/section/9.3/ link to open resource.