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OpenStudy (anonymous):
Regan is trying to find the equation of a quadratic that has a focus of (−2, 5) and a directrix of y = 13. Describe to Regan your preferred method for deriving the equation. Make sure you use Regan's situation as a model to help her understand.
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OpenStudy (perl):
it helps to draw a graph of the situation first
OpenStudy (perl):
|dw:1420912413717:dw|
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