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# Intervals of ConvergenceIn Exercise , (a) find | Ch 10.7 - 6E

ISBN: 9780321884077 57

## Solution for problem 6E Chapter 10.7

Thomas' Calculus: Early Transcendentals | 13th Edition

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Problem 6E

Intervals of Convergence

In Exercise , (a) find the series’ radius and interval of convergence. For what values of x does the series converge (b) absolutely, (c) conditionally?

Step-by-Step Solution:

Step 1 of 5</p>

Here, we have to find

The series’ radius and interval of convergence.The value of x for which the series converges absolutely.The value of x for which the series converges conditionally.

.

Step 2 of 5</p>Let us use the ratio test in order to find the radius of convergence.

Therefore, according to the ratio test, a series is said to be absolutely convergent if

…..(1)

Therefore, according to our question, we have .

Thus,

Thus, using (1), we have

…..(2)

Therefore, we have

We get the interval of convergence from (2) as .

Therefore, we get the radius of convergence as  and the center is .

Step 3 of 5</p>

Now let us test the convergence of the series at the endpoints.

At , we have the series as

, is diverging geometric series..

At , we have the series as

, is a divergent series.

Step 4 of 5

Step 5 of 5

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