Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 11 - Sequences; Induction; the Binomial Theorem - Section 11.1 Sequences - 11.1 Assess Your Understanding - Page 827: 21

Answer

The first five terms are: $s_1 = \dfrac{1}{2} \\s_2= \dfrac{2}{5} \\s_3= \dfrac{2}{7} \\s_4= \dfrac{8}{41} \\s_5= \dfrac{8}{61}$

Work Step by Step

We are given that {$s_n$} $=\dfrac{2^n}{3^n+1}$ In order to determine the first five terms, we will have to substitute $n=1,2,3,4,5$ into the given sequence {$s_n$}: $s_1 = \dfrac{2^1}{3^1+1}=\dfrac{2}{4} = \dfrac{1}{2} \\s_2= \dfrac{2^2}{3^2+1}=\dfrac{4}{10} = \dfrac{2}{5} \\s_3= \dfrac{2^3}{3^3+1}=\dfrac{8}{28} = \dfrac{2}{7} \\s_4= \dfrac{2^4}{3^4+1}=\dfrac{16}{82} = \dfrac{8}{41} \\s_5= \dfrac{2^5}{3^5+1}=\dfrac{32}{244} = \dfrac{8}{61}$
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