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

    Jun 30, 2009, 11:17 AM
    Find the vertex, focus, and directrix of the parabola given by the equation.
    (x-9)^2=-(y+8)?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 30, 2009, 12:28 PM
    There are similar posts. Search those.

    Know that

    where (h,k) are the coordinates of the vertex.

    p is the distance between the focus and vertex or between the vertex and the directrix.

    If the sign is negative, then it opens in the negative y direction.

    In this case, 4p = -1. You can easily find p now and the focus and directrix from the vertex coordinates.
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