Question

Derive the equation of the parabola with a focus at (2, 4) and a directrix of y = 8.

Answer 1

differentiation with respect to which variable?

Answer 2

I'm not sure what you're asking?

Answer 3

For me this is more of a process issue than anything else.

Answer 4

First, put the information of the problem in a graphic

Then, for theory you know that the parabola opens with opposite direction of where your directrix. and looking at its focus. So you have this graphic

Answer 5

sorry for the late. I had problems with the editor ._.
I think is like this..

Answer 6

That looks about right, Thanks!

Answer 7

p is negative