Thursday, 17 April 2014

Recall Foil

Foil: e.g,          (x+2)(x-3) = x^2 -3x+2x-6
                        (3a-2b)(4a+3b) = 12a^2+9ab-8ba-6b^2
                                                  = x^2-x-6 

                                                            = 12a^2+ab-6b^2
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