Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 3 - Exponents, Polynomials and Functions - 3.2 Combining Functions - 3.2 Exercises - Page 244: 35



Work Step by Step

The student changed the subtraction operator to multiplication operator by placing the minus sign inside the parenthesis. The correct simplified expression of $ (2x+7)-(6x-9) ,$ is \begin{array}{l}\require{cancel} 2x+7-6x+9 \\\\= 2x+7-6x+9 \\\\= (2x-6x)+(7+9) \\\\= -4x+16 .\end{array}
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