Elementary Algebra

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

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5: 72

Answer

$40$

Work Step by Step

Substituting $ x=4 $ and $ y=-4 ,$ the given expression, $ 5(x-y)-9(x+y) ,$ evaluates to \begin{array}{l}\require{cancel} 5(4-(-4))-9(4+(-4)) \\\\= 5(4+4)-9(4-4) \\\\= 5(8)-9(0) \\\\= 40-0 \\\\= 40 .\end{array}
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