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: 69

Answer

$45-19x+2x^2$

Work Step by Step

Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $ (5-x)(9-2x) ,$ is equivalent to \begin{array}{l}\require{cancel} 45+(-10x-9x)+2x^2 \\\\= 45-19x+2x^2 .\end{array}
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