Question

Identity the vertex, focus, and directrix

Answer 1

vertex: (0, 0)

focus: (-7, 0)

directrix: x=7

Explanation:

1. divide both sides by (-1/28) and you will get y^2=-28x
2. -28=-4p ----> p=7
3. focus=(-p, 0) ------> (-7, 0)
4. directrix=x=p ---------> x=7