/ 2\ | 3*x | lim |-----| x->-1+\1 + x/
Limit((3*x^2)/(1 + x), x, -1)
oo
= 447.019867549669
/ 2\ | 3*x | lim |-----| x->-1-\1 + x/
-oo
= -459.019867549669
447.019867549669