Cannot solve this for the life of me...

When is 2t / (t+1)^3 > 0 ?

I seem to think it is (-infinity,-1)U[0,infinity), but then I am unsure.

The above expression is also equivelant to 2 / (t^2 (1 + 1/t)^3) - and that is only positive for t > -1.

I am extremely confused!! Help!!! Thanks!