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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Perhaps your just reading the wrong section. An hyperbola with a directrix? Are you sure?
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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