College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 4 - Section 4.3 - Logarithmic Functions - Summary Exercises on Inverse, Exponential, and Logarithmic Functions - Page 427: 40



Work Step by Step

$\bf{\text{Solution Outline:}}$ To solve the given equation, $ x=\sqrt{\log_{1/2} \dfrac{1}{16}} ,$ use the properties of logarithms to find the value of the radicand. Then simplify the radical. $\bf{\text{Solution Details:}}$ Using exponents, the equation above is equivalent to \begin{array}{l}\require{cancel} x=\sqrt{\log_{1/2} \left(\dfrac{1}{2}\right)^4} .\end{array} Using the Power Rule of Logarithms, which is given by $\log_b x^y=y\log_bx,$ the equation above is equivalent \begin{array}{l}\require{cancel} x=\sqrt{4\log_{1/2} \dfrac{1}{2}} .\end{array} Since $\log_b b =1,$ the equation above is equivalent to \begin{array}{l}\require{cancel} x=\sqrt{4(1)} \\\\ x=\sqrt{4} \\\\ x=2 .\end{array}
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