You will be able to factor a polynomial when "a" is greater than 1 using The Big X Method. To prove this you will bring your notes to class. Come to class prepared with one or two questions from the videos.
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In this video you when learn how to factor a trinomial using The BIG X Method. Make sure to check each example by multiplying the factors.
Source: http://youtu.be/vVh619_XZ_s