Q 37. - Precalculus Enhanced with Graphing Utilities

Question

Find the domain of the function.

$f\left(x\right)=\ln \left(x-3\right)$

Step-by-Step Solution

Answer

The domain of the given function $f\left(x\right)$ is $\left(3,\infty \right)$.

Step 1. Given information

A logarithmic function is given as $f\left(x\right)=\ln \left(x-3\right)$.

Step 2. Formula Used

The domain of the logarithmic function $f\left(x\right)=\ln \left(x\right)$ is determined by $x>0$. 

Step 3. Finding The Domain

The function is $f\left(x\right)=\ln \left(x-3\right)$

Now, for the domain,

$x-3>0$

On solving

$x>3$

The required domain of $f\left(x\right)$, using

interval notation, is $\left(3,\infty \right)$.