Answer: D
Step-by-step explanation: Just took the test
To solve this problem you must apply the proccedure shown below:
1. You have to find the radius <span>of convergence of the following Maclaurin series:
</span>

2. Let's take the denominator and find the roots:

3. The roots are

and the distance from the origin is

.
Therefore, the answer is:

u = 2 x + 1, d u = 2 d x, d x = d u / 2

- 9 / ( 2 + 1 )² - ( - 9 / ( 0 + 1 )² =
- 9 / 9 + 9 = - 1 + 9 =
8