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Mathematics 15 Online
OpenStudy (anonymous):

Determine the focus and directrix of the given parabola, and sketch the graph: x^2 = -4y

OpenStudy (anonymous):

OpenStudy (anonymous):

y = -x^2/4

OpenStudy (anonymous):

How did you get that?

OpenStudy (anonymous):

http://www.wolframalpha.com/input/?i=x^2+%3D+-4y

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