Answer
It is a solution.
Work Step by Step
As the problem asks us to do, we plug in -8 for a.
$9(-8)-(-72)=0 \\\\ -72+72=0 \\\\ 0=0$
This is true, so it is a solution.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - 1-8 An Introduction to Equations - Practice and Problem-Solving Exercises - Page 56: 20
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