15: The condition 2x − 4 ≠ 0 gives the domain
D( f ) = (−∞,2) ∪ (2,∞).
Now it is time to find limits at −∞, at 2 from the left and from the right, and at ∞.
Hint on limit at −∞ Hint on limit at 2 from the left Hint on limit at 2 from the right Hint on limit at ∞ Answer