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Mathematics 7 Online
OpenStudy (anonymous):

Find the equation of a parabola with focus F(1,-11) and directive x=21 please help! I don't even know what a parabola equation is!

OpenStudy (anonymous):

you don't know what a parabola is?

OpenStudy (anonymous):

first you find the vertex, it is halfway between the directrix and the focus.

OpenStudy (anonymous):

|dw:1420236688815:dw|

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