Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - 1-7 The Distributive Property - Practice and Problem-Solving Exercises: 70

Answer

8b-20 (error is explained below)

Work Step by Step

The student did not distribute the 4 to the -5, which is inside of the parenthesis. The distributive property allows us to distribute anything multiplied by something inside of the parentheses to whatever is inside of the parenthesis. Thus, we distribute the 4 to everything inside the parentheses, giving us 8b-20.
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