The function is $\"\"$ .

All possible values of $\"\"$ is the domain of the function.

Since it is a rational function, the denominator of the function should not be the zero.

$\"\"$

$\"\"$ and $\"\"$

Therefore, the domain of the function is all real numbers of $\"\"$ except $\"\"$ and $\"\"$ .

Domain in set-builder notation is $\"\"$ .

The domain in interval notation is $\"\"$ .

Ana thinks the domain is $\"\"$ .

Mason thinks the domain is $\"\"$ .

So Ana is wrong.

Mason answer is correct.