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    smikesh's Avatar
    smikesh Posts: 3, Reputation: 1
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    #1

    May 16, 2008, 07:26 AM
    directrix&focuses in parabola
    parabola


    Find the eqn: of the parabola whose focus is (3,-4) & directrix is x-y+5=0 ?
    help me
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    May 16, 2008, 08:59 AM
    Use the distance formula and the formula for the distance from a point to a line.



    Square both sides, then expand and simplify:
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