/ 2 \ lim \-6 + x + 2*x/ x->oo
Limit(-6 + x^2 + 2*x, x, oo, dir='-')
oo
/ 2 \ lim \-6 + x + 2*x/ x->-2+
-6
= -6.0
/ 2 \ lim \-6 + x + 2*x/ x->-2-
-6.0