Set the argument of the logarithm equal to zero.

Add to both sides of the equation.

The vertical asymptote occurs at .

Vertical Asymptote:

Vertical Asymptote:

Replace the variable with in the expression.

Simplify the result.

Subtract from .

The natural logarithm of is .

The final answer is .

Convert to decimal.

Replace the variable with in the expression.

Simplify the result.

Subtract from .

The final answer is .

Convert to decimal.

Replace the variable with in the expression.

Simplify the result.

Subtract from .

The final answer is .

Convert to decimal.

The log function can be graphed using the vertical asymptote at and the points .

Vertical Asymptote:

Graph f(x) = natural log of x-1