Respuesta :

Answer:

vertex: (0, 0)

focus: (-7, 0)

directrix: x=7

Step-by-step 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