Question

Find the focus, directrix and axis of the parabola with equation x^2 = 16y

Answer 1

parabola
focus | (0, 4)
vertex | (0, 0)
semi-axis length | 4
focal parameter | 8
eccentricity | 1
directrix | y = -4

Answer 2

I received (0,4) y = -4, y axis but apparently there is another answer.

Answer 3

There isn't right? My teacher only gave me 4/5 points.

Answer 4

I don't think so...

Answer 5

Ask the teacher, I double checked my work.

Answer 6

Thanks. I'll ask him.