College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 4, Exponential and Logarithmic Functions - Chapter 4 Test - Page 327: 6

Answer

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Work Step by Step

Law of Logarithms: 1. $\log(AB)=\log A +\log B$ 2. $\log(A/B)=\log A -\log B$ 3. $\log(A^C)=C\log A$ 4. $\log_{A}B=\frac{\log_{C}A}{\log_{C}B}$ Properties of Loagrithms: 1. $\log_{a}1=0$ 2. $\log_{a}a=1$ 3. $\log_{a}a^x=x$ 4. $a^{\log_{a}x}=x$ a. From the law of logarithms 3 and then law of logarithms 1... $\log a+2\log b=\log a+\log b^2=\log ab^2$ b. From the law of logarithms 2... $\ln(x^2-25)-\ln (x+5)=\ln \left(\frac{x^2-25}{x+5}\right)=\ln(x-5)$ c. From the law of logarithms 3 and then the law of logarithms 2 and then law of logarithms 1... $\log_{2}3-3\log_{2}x+\frac{1}{2}\log_{2}(x+1)=\log_{2}3-\log_{2}x^3+\log(\sqrt {x+1})=\log_{2}(3/x^3)(\sqrt {x+1})$
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