/ 3 \ | 3 x *(1 + x)| lim |x + ----------| x->-1+\ 2 /
Limit(x^3 + (x^3*(1 + x))/2, x, -1)
-1
= -1
/ 3 \ | 3 x *(1 + x)| lim |x + ----------| x->-1-\ 2 /
-1.0