# Homework Help: Partial fractions and integral

1. Jul 14, 2009

### nameVoid

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

I((3x^2+x+4)/(x^4+3x^2+2),x)
I((3x^2+x+4)/((x^2+1)(x^2+2)),x)
I(3x^2/((x^2+1)(x^2+2)),x)+I((x+4)/((x^2+1)(x^2+2)),x)
from here i have used partial fractions with no luck

2. Relevant equations

3. The attempt at a solution

2. Jul 14, 2009

### Gib Z

Re: integral

It is probably easier to use partial fractions right after you get to:

$$\int \frac{ 3x^2 + x+4}{(x^2+1)(x^2+2)} dx$$.

Please show us your working so we can tell you where you went wrong.

3. Jul 14, 2009

### HallsofIvy

Re: integral

$$\frac{ 3x^2 + x+4}{(x^2+1)(x^2+2)}= \frac{Ax+ B}{x^2+ 1}+ \frac{Cx+ D}{x^2+ 2}$$
Now, what did you do to try to find A, B, C, and D?