Homework Help: Help with Integral

1. Aug 21, 2005

laker88116

$$\int \frac{\(x+9}{x^2+9} dx$$

I am not sure where to start. I have a feeling that I need to subsitute twice, but I just don't know what to use first. Any help is appreciated.

2. Aug 21, 2005

Pyrrhus

Try

$$\int \frac{x dx}{x^{2}+9} + 9 \int \frac{dx}{x^{2}+9}$$

3. Aug 21, 2005

laker88116

Wow, that changes everything, ln and tan inverse I think just looking at it, let me try this, I can't believe I overlooked that.

4. Aug 21, 2005

laker88116

Yea, I solved it, thank you for the help.