Help Finding Concave up of a large rational function
So far I have:
x Int= (-2,0)
Horizontal Asymptote= 1
Vertical Asymptote= Does Not Exist
I need f(x) is concave up on the interval(s)=
As you can see the double prime is nasty, and I don't know how to simplify it in order to help me find the concave up intervals. Any help or direction would be appreciated.