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 - 1-2 Order of Operations and Evaluating Expressions - Practice and Problem-Solving Exercises - Page 14: 41

Answer

$12$

Work Step by Step

Using order of operations, the given expression, $ 3[42-2(10^2-9^2)] ,$ simplifies to \begin{array}{l}\require{cancel} 3[42-2(100-81)] \\\\= 3[42-2(19)] \\\\= 3[42-38] \\\\= 3[4] \\\\= 12 .\end{array}
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