Answer
8
Work Step by Step
Using the rules of Algebra, we find:
$$\left(\sqrt{5x+9}\right)^2=7^2\\ 5x+9=49 \\ x=8$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 7 Exponential and Logarithmic Functions - 7.3 Use Functions Involving e - 7.3 Exercises - Mixed Review - Page 498: 67
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