Question

What is the equation of a parabola with vertex (0, 0) and directrix y = 12.




just tell me what i have to do to get this problem done please

Answer 1

start by sketching the vertex and directrix, that will give you an clue about the concavity


next you need the perpendicular distance from the vertex to the directrix,

this is called the focal length abbreviated to a

so that's a start

Answer 2

i dont understand

Answer 3

what about the equation cant i use the equation to solve this problen
horizontal directrix equation of parabolas

Answer 4

ok...



the vertex is below the dirextrix so the parabola is concave down