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OpenStudy (anonymous):
graph the parabola with the focal point (0,5) and the vertex (0,0) find the equation for the directrix
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OpenStudy (anonymous):
please explain how you get the equation for the directrix
OpenStudy (accessdenied):
The directrix is the same distance from the parabola as the focus, just 'behind' the parabola's concave part. |dw:1336607193428:dw|
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