Answer
$\frac{1}{72}$
Work Step by Step
We convert to fractions, find a common denominator, and subtract:
$2^{-3}-3^{-2}=\displaystyle \frac{1}{8}-\frac{1}{9}=\frac{9}{72}-\frac{8}{72}=\frac{1}{72}$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Chapter P Review - Exercises - Page 76: 28
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