Question 1056620
Four units on the other side of the vertex will be the directrix.  That will be {{{x=-2}}}.


Equation will be similar to {{{-4*4x=y^2}}}, and considering the vertex  (3,2), the equation will BE  {{{highlight(-16(x-3)=(y-2)^2)}}}.


Find how this works in these helpful videos:


<a href="https://www.youtube.com/watch?v=M8LGsQMwwj4">Definition of parabola to form Equation</a>


<a href="https://www.youtube.com/watch?v=Wworlx39KfQ">Same idea but vertex not at origin, and different orientation</a>