Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 5 - Exponential and Logarithmic Functions - 5.3 One-to-One Functions; Inverse Functions - 5.3 Assess Your Understanding - Page 282: 79



Work Step by Step

The base is same on the 2 sides of the equation (and it is not 1), hence they will be equal if the exponents are equal. Hence $x=3x+8$, Solve the equation: \begin{align*} x&=3x+8\\ x-3x&=8\\ -2x&=8\\ \frac{-2x}{-2}&=\frac{8}{-2}\\ x&=-4 \end{align*}
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