a. State the Domain of the function.
b. Find all intercepts.
c. Find any vertical and horizontal asymptotes.

1. I assume that you mean:

$\displaystyle f(x)=\dfrac{3(x+2)}{x^2+x-12}$

2. If so: Before I'm going to help you I must know which difficulties you have at which part of the problem. Please publish your work so I can see where you need some additional information.