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anonymous

  • one year ago

What is the equation of the parabola with a focus at (0, -5) and directrix y = 5?

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  1. anonymous
    • one year ago
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    To derive a quadratic equation using distances, used the combined distance formula. The combined distance formula is \[\sqrt{(y_2-y_1)^2+(y_2-y_1)^2}=\sqrt{(y_2-y_1)^2}\]. Plug in the focus on the left side of the equation, and plug the directrix on the right side.

  2. anonymous
    • one year ago
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    y=4py directix=-p

  3. anonymous
    • one year ago
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    y^2=4px

  4. anonymous
    • one year ago
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    of course you have to find out which side it opens to

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