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}
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
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
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