Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 12 - Review: 85

Answer

{$\frac{\log 20}{\log 7}$}, {$1.5395$}

Work Step by Step

Step 1: $7^{x}=20$ Step 2: $\log 7^{x}=\log 20$ Step 3: $x\log 7=\log 20$ Step 4: $x=\frac{\log 20}{\log 7}\approx1.5395$ Therefore, the exact solution is {$\frac{\log 20}{\log 7}$} whereas the four decimal approximation is {$1.5395$}.
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