as x-∞, f(x) →-∞ and as x-∞, f(x) → -∞
as x-∞, f(x) → ∞ and as x-∞, f(x) → ∞
as x=-∞, f(x) → ∞ and as x-∞, f(x) → ∞
as x=-∞, f(x) - ∞ and as x - ∞, f(x) → ∞

as x fx and as x fx as x fx and as x fx as x fx and as x fx as x fx and as x fx class=