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Math Help - Parabola

  1. #1
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    Parabola

    Find an equation of the parabola with focus (2,4) and directrix y=-2.

    Please help me or just give me an idea on how to answer this... Thanks!
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  2. #2
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    Quote Originally Posted by lance View Post
    Find an equation of the parabola with focus (2,4) and directrix y=-2.

    Please help me or just give me an idea on how to answer this... Thanks!
    Use the definition of a parabola:

    The point P(x, y) is situated on a parabola if it's distance to the focus equals it's perpendicular distance to the directrix.

    Get rid of the square-root by squaring the equation. Afterwards simplify.
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