Replace with .

Interchange the variables.

Rewrite the equation as .

Add to both sides of the equation.

Rewrite in exponential form using the definition of a logarithm. If and are positive real numbers and , then is equivalent to .

Rewrite the equation as .

Replace the with to show the final answer.

Set up the composite result function.

Evaluate by substituting in the value of into .

Combine the opposite terms in .

Add and .

Add and .

Exponentiation and log are inverse functions.

Since , is the inverse of .

Find the Inverse Function f(x) = log base 3 of x-1