Answer
5
Work Step by Step
For a logarithmic expression, we know the following:
$$log_{b}\ y=x \Rightarrow b^x=y$$
Thus, we find:
$$3^x=243 \\ x=5$$
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 - Chapter Review - Page 541: 17
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