Question

Find the standard form of the equation of the parabola with a vertex at the origin and a focus at (0, -7)???

Answer 1

\[y = ax^2\]
\[a = \frac{1}{4p}\]
where "p" is distance from focus to vertex
distance between (0,0) and (0,-7) is (-7 - 0) = -7
therefore p = -7

Answer 2

-7x? is one of the answers

Answer 3

No plug -7 in for p to get the correct "a" coefficient