The logarithmic function is 
The natural logarithmic function:
.

The function is defined only if
.
The domain of the function
is
.
Find the
- intercept by substituting
in given function.
Substitute
in
.

The
- intercept is
.
The function
has vertical asymptote at
.


Thus, vertical asymptote is 
Graph the
. \ \

The domain of the function
is
.
The
- intercept is
.
Vertical asymptote is 