Answer:

Step-by-step explanation:
We have been given an equation of a parabola
. We are asked to find the equation of directrix of the given parabola.
First of all, we will convert our given equation in standard form of right-left opening parabola:
, where,
represents focal length and (h,k) is vertex of parabola.
We can rewrite our given equation as:


Since our given parabola has a
term, so it will be symmetric about x-axis.
The vertex of parabola is (0,0) and focal length is 6.
We know that equation of directrix of right-left opening parabola is
.



Therefore, the equation of the directrix of our given parabola is
.