Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.3: Geometric Sequences
Problem 49E
Related questions
Question
Find the interval of convergence of the series
Σ (x-8)n/(n6+2)
from n=0 to infinity
Expert Solution
Step 1
Given series is
We will use Ratio test to find interval of convergence of the series.
By Ratio test , given series converges if
Step 2
If x=7 , series becomes
which is alternating series and is convergent as the sequence {1/(n^6+2)} is decreasing and converging to 0.
If x=9, series becomes
Since,
and is convergent , therefore, by Comparison test, the series converse.
Thus, the interval of convergence of given series is [7,9]
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