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    rodneyrhoney1's Avatar
    rodneyrhoney1 Posts: 1, Reputation: 1
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    #1

    May 20, 2011, 05:14 PM
    how do you find the directrix of a parabola?
    Find the directrix of the parabola x + 8 = 1/8(y - 2)2.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    May 21, 2011, 05:50 AM

    Have it in the form:



    The directrix becomes the line with equation x = k-p.
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