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: 77



Work Step by Step

Combining like terms, the given expression, $ (a-b)-(a+b) ,$ simplifies to \begin{array}{l}\require{cancel} a-b-a-b \\\\= (a-a)+(-b-b) \\\\= 0-2b \\\\= -2b .\end{array} Substituting $ b=-17 ,$ the resulting expression above evaluates to \begin{array}{l}\require{cancel} -2(-17) \\\\= 34 .\end{array}
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