Answer
$\dfrac{103}{17}$
Work Step by Step
The given expression, $
\dfrac{4(18-8)+7\cdot9}{9^2-8^2}
$, simplifies to
\begin{array}{l}\require{cancel}
\dfrac{4(10)+63}{81-64}
\\\\=
\dfrac{40+63}{81-64}
\\\\=
\dfrac{103}{17}
.\end{array}
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - Review Exercises: Chapter 1 - Page 76: 56
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