$\"\"$

The function is $\"\"$ .

The general form of polynomial function is $\"\"$ , \ \

where $\"\"$ are real numbers and $\"\"$ is a non negative integer.

Rewrite the function in the form of polynomial.

$\"\"$ .

The variable $\"\"$ is raised to the power $\"\"$ which is a negative integer.

Therefore $\"\"$ is not a polynomial function.

$\"\"$

The function $\"\"$ is not a polynomial function.