$\"\"$

The equation is $\"\"$ .

Solve for $\"\"$ .

Consider $\"\"$ .

Subtract $\"\"$ from each side.

$\"\"$ .

Extract square root on each side.

$\"\"$ .

We see that there is a $\"\"$ sign when $\"\"$ is written explicitly in terms of $\"\"$ .

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

$\"\"$

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