Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 5 - Exponents and Polynomials - 5.3 - Multiplying Polynomials - Problem Set 5.3: 54

Answer

$x^2-9x-90$

Work Step by Step

Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $ (x-15)(x+6) ,$ is equivalent to \begin{array}{l}\require{cancel} x^2+(6x-15x)-90 \\\\= x^2-9x-90 .\end{array}
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