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anonymous

  • 5 years ago

How would you write an equation of the parabola with a directrix y = -1 and vertex (0,0)?

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  1. anonymous
    • 5 years ago
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    as the vertex is the origin there's no constant term

  2. amistre64
    • 5 years ago
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    the direct-x is the line that is equal distance from the curve of the graph to the focus of the parabola. If the directix is at y=-1 then the focus is at y=1. I am guessing that the equation is (x^2), but I recall the equation of a parabola taking a slightly different form when you write it out geometrically.

  3. anonymous
    • 5 years ago
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    given the focus point its easier to find the equation of this parabola, as the equation is (x-h)^2=4p(y-k) where (h,k)=(0,0)

  4. anonymous
    • 5 years ago
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    Thanks, got it.

  5. anonymous
    • 5 years ago
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    p is the distance between vertex and directrix..try to find the value using this

  6. anonymous
    • 5 years ago
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    so, whats the equation?

  7. anonymous
    • 5 years ago
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    y = 1/4x^2

  8. anonymous
    • 5 years ago
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    good

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