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    rockergurl500's Avatar
    rockergurl500 Posts: 1, Reputation: 1
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    #1

    Feb 1, 2010, 11:13 PM
    Finding an equation for the parabola described?
    1. Focus (1,0); directrix x=-3

    2. Focus (0,-3); vertex (2,-3)

    3. Vertex (5,1); directrix x=3

    Please refresh my memory on this because I literally am drawing a blank :/
    Thanks!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Feb 2, 2010, 08:07 AM

    The general formula for a parabola with horizontal axis (all three of yours have horizontal axes) is



    Vertex = (h, k)
    Directrix : y = k-p
    Focus : (h, k+p)

    I think that's enough. Care to give it a try? Post your answers! :)
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