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Math Help - Another conics. Sorry I'm terrible at this stuff :(

  1. #1
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    Another conics. Sorry I'm terrible at this stuff :(

    Find an equation for the central hyperbola with one focus at (4,0), directrix at x=1 and eccentricity 2. Sketch


    I've tried it many times, but no answer. Can anyone help me out?
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  2. #2
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    Perhaps your just reading the wrong section. An hyperbola with a directrix? Are you sure?
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    Forum Admin topsquark's Avatar
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    I don't know if this is the best link, but this may help you both. (Go about half-way down the page.)

    -Dan
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