Answer
$-\frac{7}{3}$
Work Step by Step
Let $f(x)=0$, we have $3x+7=0 \longrightarrow 3x=-7 \longrightarrow x=-\frac{7}{3}$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.1 Angles and Their Measure - 6.1 Assess Your Understanding - Page 365: 134
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