what's the equation of a parabola

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using the distance formula what's the equation of a parabola with its focus at (0,7) and directrix at y=-7

Jun 6th, 2015

Thank you for the opportunity to help you with your question!

This is an equation of a parabola that opens left with vertex at origin.
Its basic form of equation: y^2=-4px
For given parabola:
vertex:(0,0)
axis of symmetry: y=0 
p=7 (distance from vertex to directrix and focus on the axis of symmetry)
4p=28


Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 6th, 2015

Which of these is the equation for a parabola whose vertex is at the origin and focus is at (0, ¼)?


Jun 6th, 2015

Which of these is the equation for a parabola whose vertex is at the origin and focus is at (0, ¼)?


Jun 6th, 2015

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