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Question 1056076: write an equation of the parabola with the given characterists
focus: (0,-4) directrix: y =4
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! write an equation of the parabola with the given characterists
focus: (0,-4) directrix: y =4
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Plot the focus at (0,-4)
Sketch the directrix at y = 4
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The vertex is half-way between the line and the fucus
Vertex at (0,0)
p = 2
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Vertex form:: (x-h)^2 = 4p(y-k)
x^2 = 8y
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Ans: y = (1/8)x^2
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Cheers,
Stan H.
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