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March 29, 2017

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Identify the equation of a parabola whose focus is at (5,-1) and whose directrix is x=3.

vertex=(-5,-1)
p=-6
4p=-24
(x-5)=(-24)(y+1)^2

I got it wrong

  • Math - ,

    Hint:
    The focus is at (5,-1), and the directrix is at x=3, so the vertex lies halfway between the two.
    The value of p is the distance between the vertex and the focus.
    Wiki has an excellent article on the subject.
    http://en.wikipedia.org/wiki/Parabola

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