
Kenneth S. answered 12/03/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Use Long Multiplication, placing the longer factor on one line of a sheet of paper, and the shorter factor beneath it.
Multiply each term of the shorter factor by each term of the longer factor (on top line); place all such products of two terms in below, lined up in columns of LIKE terms; combine to get the product polynomial.