Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 4 - Section 4.5 - Exponential and Logarithmic Functions - 4.5 Exercises - Page 368: 52

Answer

$x=1$

Work Step by Step

$\ln\Big(x-\dfrac{1}{2}\Big)+\ln2=2\ln x$ Combine the logarithms on the left as a product and rewrite the expression on the right as a power: $\ln2\Big(x-\dfrac{1}{2}\Big)=\ln x^{2}$ $\ln(2x-1)=\ln x^{2}$ Since $\ln$ is one to one, the equation becomes: $2x-1=x^{2}$ Take all terms to the right side: $x^{2}-2x+1=0$ Solve by factoring: $(x-1)^{2}=0$ We get one solution: $x=1$
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