Which equation represents a parabola with a vertex at the origin and a focus at (0,-1)

We are given parabola with vertex at origin (0,0) and given focus (0,-1).

We know vertex is given by (h,k).

Therefore, h=0 and k=0.

Formula for focus is (h, k + p).

On comapring with given focus

k+p = -1.

Plugging value of k=0 in above equation we get

0 +p =-1.

p = -1.

Parabola equation is  4p (y - k)=(x - h)^2

Plugging values of h, k and p in parabola equation, we get

Dividing both sides by -4, we get

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is there answer choices?

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