Math Help - Evaluate a integral

1. Evaluate a integral

Would I use Partial Fractions for this integral? I'm not sure what to do.

$\frac{1}{(x+1)(x+3)}dx$

2. Originally Posted by killasnake
Would I use Partial Fractions for this integral? I'm not sure what to do.

$\frac{1}{(x+1)(x+3)}dx$
yes. use partial fractions.

write $\frac 1{(x + 1)(x + 3)} = \frac A{x + 1} + \frac B{x + 3}$

now find A and B, similar to how i told you to in your last thread

3. okay cool thank you!

4. Do not use partial fraction.

$\frac{1}{(x+1)(x+3)} = \frac{1}{2}\cdot \frac{(x+3) - (x+1)}{(x+1)(x+3)} = \frac{1}{2(x+1)} - \frac{1}{2(x+3)}$.