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This is a worksheet, with key, that describes 4 ways of factoring trinomials where the leading coefficient is not 1. The 4 ways are: guess and check, factoring by grouping, box method, and fraction method. The worksheet (and key) works through one example for each method. The steps are explained in words and there is space for students do each step (and for the teacher to do it at the board), in the key (which is where the thumbnails come from), the steps are done in red.