/ 2\ | -81 + x | lim |18 - 11*x + --------| x->9+| 2 | \ x /
Limit(18 - 11*x + (-81 + x^2)/x^2, x, 9)
-81
= -81
/ 2\ | -81 + x | lim |18 - 11*x + --------| x->9-| 2 | \ x /
-81.0