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#64 to #12 - giinthir (01/18/2013) [-]
Because the first portion is x-2 and the second is +2, that results in nothing, leaving us with x^2
#72 to #64 - dasbrot (01/19/2013) [-]
F.O.I.L. stands for First, Outer, Inner, Last. It's the order of how you multiply the expression following PEMDAS. You end up with x^2+2x-2x-4. 2x and 2x cancels out, leaving you with x^2-4
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