Question 54271
x^2 - 4x - 16 = 6y
x^2 - 4x = 6y + 16
(x - 2)^2 = 6y + 20
(x - 2)^2 - 20 = 6y
(1/6)(x - 2)^2 - 10/3 = y
vertex: (2,-10/3)
p = 1/(4a) = 1/(4/6) = 3/2 = 1.5
foci: (2,-10/3 + 1.5)
directrix: y = -10/3 - 1.5