Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 5 - Exponential and Logarithmic Functions - Chapter Review - Chapter Test - Page 348: 10



Work Step by Step

Using the Change-of-Base Formula, we know that $\log_a{b}=\frac{\log_c{b}}{\log_c{a}}$. Use the Change-of-Base formula and a calculator to obtain: $\log_3{21}=\frac{\ln{21}}{\ln{3}}=2.771243749\approx2.771$
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