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 $\"\"$

$\"\"$ , $\"\"$ and $\"\"$ .

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

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

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

Set-builder notation is preferential because it is more concise to list the three real numbers to which $\"\"$ cannot be equal rather than the four intervals of which $\"\"$ is an element.

Domain set is $\"\"$ .