/ 2 \ lim \-5 + x - 4*x/ x->-1+
Limit(-5 + x^2 - 4*x, x, -1)
0
= -1.48168935459259e-31
/ 2 \ lim \-5 + x - 4*x/ x->-1-
= -4.5492224530916e-32
-1.48168935459259e-31