Answer
$\dfrac {728}{9}=80\dfrac {8}{9}$
Work Step by Step
$\sum ^{3}_{i=-2}2\left( 3\right) ^{i}=2\times 3^{-2}+2\times 3^{-1}+2\times 3^{0}+2\times 3^{1}+2\times 3^{2}+2\times 3^{3}=\dfrac {728}{9}=80\dfrac {8}{9}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - 11.1 Sequences and Series - 11.1 Exercises - Page 1014: 47
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