Answer
$-2387$
Work Step by Step
Here, $ a_1=7$ and $ r=-2$
$ S_{10}=\dfrac{7[ 1-(-2)^{10}]}{1-(-2)}$
$= \dfrac{7( 1-2^{10})}{1+2}$
$=\dfrac{7( 1-1024)}{3}$
$=\dfrac{-7161}{3}$
$=-2387$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Test - Page 1126: 11
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