Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 10 - Cumulative Review Exercises - Page 818: 5



Work Step by Step

We know that if $a\gt0,a\ne1$, then $a^b=a^c\longrightarrow b=c$ $81=3^4$ Thus here: $2x-1=4\\2x=5\\x=\frac{5}{2}$
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