$\"\"$

The equation is $\"\"$ .

Solve the above equation for $\"\"$ .

$\"\"$

Subtract $\"\"$ from each side.

$\"\"$

Divide each side by $\"\"$ .

$\"\"$

For any input of $\"\"$ , we get two outputs for $\"\"$ .

An input $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

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

For any input of $\"\"$ , we get two outputs for $\"\"$ .

So, the equation $\"\"$ does not defines $\"\"$ as a function of $\"\"$ .

$\"\"$

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