### Home > CALC > Chapter Ch2 > Lesson 2.4.1 > Problem 2-144

2-144.

At a vertical asymptote, *f*(*x*) approaches −∞ from the left and +∞ from the right.

Reason 1: ∞ is not finite.

Reason 2: +∞ does not agree with −∞

Careful! Just because *f*(4) exists, does not mean that the limit *x*→4 exists.