Answer
$\{5\}$
Work Step by Step
Note that $243=3^5$
Thus,
$3^x=243
\\3^x=3^5$
We can see that the bases are equal (and not $1$ or $ -1$), hence the exponents must be equal.
Therefore,
$x=5.$
The solution set is: $\{5\}$.
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: 5
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