Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 11 - Further Topics in Algebra - 11.3 Geometric Sequences and Series - 11.3 Exercises: 40

Answer

$10$

Work Step by Step

$\sum ^{4}_{i=1}\left( -2\right) ^{i}=\dfrac {a_{1}\left( r^{n}-1\right) }{r-1}=\dfrac {\left( -2\right) \times \left( \left( -2\right) ^{4}-1\right) }{-2-1}=10$
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