21: Conditions
    • x² − 2x − 3 > 0,
    • x² + x − 6 > 0
give the domain

D( f ) = (−∞,−3) ∪ (3,∞).

Now it is time to find limits at −∞, at −3 from the left, at 1 from the right, and at ∞.

Hint on limit at −∞
Hint on limit at −3 from the left
Hint on limit at 3 from the right
Hint on limit at ∞
Answer