Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 3 - Section 3.2 - Exponential Functions - Exercise Set: 102

Answer

$x=21$

Work Step by Step

RECALL: $\log_b{x}=y \longrightarrow b^y=x.$ Use the rule above to write the given equation in exponential form, then solve the equation: $\begin{array}{ccc} &5^2 &= &x+4 \\&25 &= &x+4 \\&25-4 &= &x+4-4 \\&21 &= &x \end{array}.$ Thus, $x=21$.
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