/ 2 3\ lim \-4 + x - 5*x + 2*x / x->-1+
Limit(-4 + x - 5*x^2 + 2*x^3, x, -1)
-12
= -12.0
/ 2 3\ lim \-4 + x - 5*x + 2*x / x->-1-
-12.0