$\"\"$

The directrix of parabola is $\"\"$ .

The eccentricity of parabola is $\"\"$ .

$\"\"$ is negative and it is to the left of the focus.

Therefore, Standard from this conic with $\"\"$ is $\"\"$ .

Substitute $\"\"$ and $\"\"$ in standard form.

$\"\"$

$\"\"$ .

The polar equation of the parabola is $\"\"$ .

$\"\"$

The polar equation of the parabola is $\"\"$ .