# Homework Help: Differential Equation homework help

1. Jul 10, 2008

### Mivg

1. The problem statement, all variables and given/known data

f(x) = $$\sum$$ $$\frac{9^{n}}{4n}$$ x$$^{2n}$$

n=1, $$\infty$$ is on top of the summation sign.

2. Relevant equations

a) Use the Ratio Test to find the radius of convergence of the Power Series
b) Find f $$\grave{}$$(x) and write out the first three (non-zero) terms of the power series for f $$\grave{}$$(x)

2. Jul 10, 2008

### Tom Mattson

Staff Emeritus
You've, erm, omitted a section of the posting template, haven't you?

Come on, this is an easy Calc II problem. A Diff Eq student should at least be able to start it.

3. Jul 10, 2008

### Mivg

I got part a no problem, but having trouble with part b.

4. Jul 10, 2008

### Hootenanny

Staff Emeritus
There's still no attempt at a solution...

5. Jul 10, 2008

### Mivg

6. Jul 11, 2008

### Tom Mattson

Staff Emeritus
Sorry, apparently you've found the wrong website. You meant to post on http://www.wedoyourhomeworkforyou.com [Broken].

But if you want to continue to post here, you must abide by the rules that you explicitly agreed to before registering.