8. 2 (- 1)" x2" n=0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section: Chapter Questions
Problem 5T
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Find all values of x for which the series converges. For these values of x, write the sum of the series as a function of x.

8.
2 (- 1)" x2"
n=0
Transcribed Image Text:8. 2 (- 1)" x2" n=0
Expert Solution
Step 1

Given: n=0-1nx2n

for finding given summation, first we expand it by putting value of n=0,1,2,3,.........

so,

n=0-1nx2n=1-x2+x4-x6+x8+.....................            ..1

now, equation1 is infinite geometric progression whose first term is 1 and common ratio is -x2

we know that for infinite geometric progression to converge -x2<1x2<1 

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