# Sum of a series using partial fractions.

• Dec 5th 2010, 02:12 PM
elpermic
Sum of a series using partial fractions.
(a) Express the function as the sum of a power series by first using partial fractions. http://www.webassign.net/cgi-bin/sym...2A2-8%20x-9%29

Well I ended up getting the entire problem wrong. I still don't know the series notation or the interval of convergence.
• Dec 5th 2010, 02:31 PM
pickslides
• Dec 5th 2010, 02:50 PM
TheCoffeeMachine
Quote:

Originally Posted by elpermic
Well I ended up getting the entire problem wrong. I still don't know the series notation or the interval of convergence.

Well, express it as partial fractions, by noting that $10 = (x+1)-(x-9)$, or otherwise.

Then you'll need to use $\displaystyle \frac{1}{1-t} = \sum_{n \ge 0}t^n$ for $|t| < 1$.
• Dec 5th 2010, 05:18 PM
elpermic
• Dec 6th 2010, 03:44 AM
mr fantastic
Quote:

Originally Posted by elpermic

This is not what is meant by "Post your working". In fact, this question looks like part of an on-line assignment. Please read fourm rule #6.