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: 15

Answer

$a_{n}=5\times \left( -2\right) ^{n-1} =-10\left( -2\right) ^{n};$ $a_{5}=320$

Work Step by Step

$a_{n}=a_{1}r^{n-1}\Rightarrow $ $a_{n}=5\times \left( -2\right) ^{n-1}=-10\left( -2\right) ^{n};$ $a_{5}=-10\left( -2\right) ^{5}=320$
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