Factoring when "a" is not 1. Using AC Method.
Make sure to really stress the importance of creating an (organized) list of factors. This is really the only "tricky" part of this method, especially when ac is larger. A number like 120 is "large" but if student methodically generate the list of factors, it is easy. (start at 1 and 120, 2 and 60, 3 and 40, etc .... keep increasing by 1 each time. You know that you are "done" listing factor pairs when the two factors are really close together.)