Question

Asked Nov 15, 2019

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Textbook : University Calculus

Section 9.7, problem #9

In this problem we have to find the series interval of convergence. Which i found to be -3<x<3, then i went to check the endpoints to see if they are included and when plugging in -3 or 3 for x i found those series to be divergent like how it says on this website, but then the answer on the website and in the back of the book says that the endpoints are included. Why are the endpoints included if both series come out to be divergent when testing the endpoints?

Step 1

The given series is,

Step 2

At *x* = –3,

Step 3

At *x* = 3,

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