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-   -   Vertex, focus, and directrix of parabola (https://www.askmehelpdesk.com/showthread.php?t=360625)

  • Jun 2, 2009, 10:40 AM
    bscott0890
    Vertex, focus, and directrix of parabola
    How do I find the vertex, focus, and directrix of a parabola?
  • Jun 2, 2009, 10:44 AM
    Unknown008

    Arrange your equation in this form:



    or



    The vertex is (x,k); the focus is (h, k+p); the directrix is y=k-p where p is the distance from the vertex to the focus.

    You can also search;

    Parabola - Wikipedia, the free encyclopedia
  • Jun 2, 2009, 10:46 AM
    Perito
    Basically, you put your equation into a general form.



    or



    vertex = (h,k)
    focus = (h,k + p)
    directrix y = k − p. p is the distance from the vertex to the focus


    Link to: Parabola - Wikipedia, the free encyclopedia

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