$\"\"$

The function is $\"\"$ .

The given function is a radical function.

So the expression under the square root (the radicand) must be nonnegative $\"\"$ .

$\"\"$

Solve the inequality $\"\"$ .

$\"\"$

Divide each side by 3.

$\"\"$ .

The domain of $\"\"$ is $\"\"$ . $\"\"$

The domain of $\"\"$ is $\"\"$ .