Find where the function exists first and find your asymptotes/holes. I didn't work this out, you need to do this. But interval notation looks something like this:
Or, -infinity to -2, union, -2 to infinity. -2 would be a vertical asymptote or a hole. If you had more than one asymptote, let's say at x=6, you would just add it in as another interval like this:
Can you figure out yours?