Answer
$\displaystyle \frac{\ln 20}{\ln 9}$
Work Step by Step
$\ln 9$ and $ \ln 20$ are real numbers.
To isolate x, divide the equation with $\ln 9$.
Result:$\displaystyle \quad x=\frac{\ln 20}{\ln 9}$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 3 - Section 3.4 - Exponential and Logarithmic Equations - Concept and Vocabulary Check - Page 488: 3
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