Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 10 - Mid-Chapter Check Point - Page 1077: 3


First five terms $5,-15,45,-135,405$

Work Step by Step

Given: $a_1=5 $ and $r=-3$ Formula for a Geometric sequence, so $a_n=5(-3)^{n-1}$ when n=2; $a_2=a_1r=5(-3)=-15$ when n=3 ; $a_3=a_2r=-15(-3)=45$ when n=4 ;$a_4=a_3r=45(-3)=-135$ when n= 5;$a_5=a_4r=-135(-3)=405$ Thus, First five terms $5,-15,45,-135,405$
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