I keep getting the wrong answer please help!

Question

An equation of a parabola is given.

7x + 3y² = 0

(a) Find the focus, directrix, and focal diameter of the parabola.

Answer 1

(3/7)y^2 = x

(0,0) is the vertex because x=0 when y=0

the general equation is (4a)y^2 = x

4a = (3/7) ---> a = 3/38

so the directrix is x=-3/28

and the focus is (3/28 ,0)