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OpenStudy (anonymous):
derive the equation of the parabola with a focus at (0,-4) and a directrix of y=4
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OpenStudy (anonymous):
f(x)=-16x2 f(x)=16x2 f(x)=-1/16x2 f(x)1/16x2
OpenStudy (dumbcow):
|dw:1396801912848:dw| a = -1/(4p) = -1/16 parabola is neg because it opens down
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