Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 4 - Exponential and Logarithmic Functions - Section 4.6 Logarithmic and Exponential Equations - 4.6 Assess Your Understanding - Page 337: 29

Answer

$x=2$

Work Step by Step

Apply the logarithmic property: $\log_a(\dfrac{M}{N}) = \log_a M-\log_a N$ and rearrange the given expression to obtain: $\log_{1/3}[\dfrac{x^2+x}{x^2-x}] =-1$ Since, $\log_m{n} = 1 $ gives: $m^{(1)}=n$, then we have: $\log_{1/3} [\dfrac{x+1}{x-1}] =-1$ $\dfrac{x+1}{x-1}=(\dfrac{1}{3})^{-1}$ or, $\dfrac{x+1}{x-1}=3$ or, $3x^2-3x=x^2+x$ or, $2x^2-4x=0$ or, $x=0, 2$ Since, the domain of the variable is $x \gt 0$, we cannot accept the value of $x=0$ Thus, our answer is: $x=2$
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