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OpenStudy (anonymous):
Find the standard form of the equation of the parabola with a focus at (0, -9) and a directrix y = 9.
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OpenStudy (anonymous):
The vertex lies between the focus and foot of directrix. So, the graph looks like this.|dw:1373994819989:dw| And the equation in general is \[x^2 = -4ay\] We know that a=9. ( since focus is at (a,o)).
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