Basic College Mathematics (10th Edition)

by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.

Published by Pearson

ISBN 10: 0134467795

ISBN 13: 978-0-13446-779-5

Chapter 9 - Basic Algebra - 9.5 Evaluating Expressions and Formulas - 9.5 Exercises - Page 660: 20

Answer

The double negative in front of -10 should have become positive, and the -5 should not have been switched to +5.

Work Step by Step

Tatiana started with the correct expression. Starting with this expression and simplifying correctly $$ (-3)(-2)-(-10) -5 \\ = 6 +10 -5 \\ =16-5 \\ =11$$

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