Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 4 - Review - Exercises: 29

Answer

7

Work Step by Step

$Evaluate$ $the$ $expression$ $without$ $using$ $a$ $calculator:$ $\log_2 128$ Rewrite 128 as $2^7$ [Note: $2^7 = 2\times2\times2\times2\times2\times2\times2 = 128$] $$\log_2 2^7$$ Use the Third Property of Logarithms: $\log_a a^x = x$ $$\log_2 2^7 = 7$$
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