Answer
$\{91\}$
Work Step by Step
We know that if $\log{y}=x$ then $10^x=y$.
Hence,
$\log{(x+9)}=2 \longrightarrow 10^2=x+9$
Solve the equarton above to obtain
$100=x+9\\
100-9=x+9-9\\
91=x$
The solution set is: $\{91\}.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 5 - Exponential and Logarithmic Functions - Chapter Review - Chapter Test - Page 348: 15
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