Posted by Lavern on Thursday, March 29, 2012 at 3:52pm.
multiply 3x by each of the terms in the second bracket + 7 times each of the terms in the second bracket
= 12x^3 + 6x^2 + 24x + 28x^2 + 14x + 56
= 12x^3 + 34x^2 + 38x + 56
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