Question

Write the equation of a parabola with a vertex at (0, 0) and a directrix y = -1.

Answer 1

The equation is written:


`y = (x - h)^2 + k`
where h is the x coordinate of the vertex and k is the y coordinate of the vertex

So we just put it in the equation:


`y=x^2`

And thus if
`y=-1`, then
`x=i`, where
`i= √(-1)`