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OpenStudy (anonymous):
Please help Chelsea is trying to find the equation of a quadratic that has a focus of (1, 3) and a directrix of y = −3. Describe to Chelsea your preferred method for deriving the equation. Make sure you use Chelsea's situation as a model to help her understand.
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OpenStudy (perl):
you can use equation (x-h)^2 = 4p(y-k)
OpenStudy (mathstudent55):
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