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OpenStudy (anonymous):
What is the equation of a parabola with vertex (0,0) and directrix x= -3?
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OpenStudy (anonymous):
what's a directrix??
OpenStudy (anonymous):
|dw:1337495255081:dw| a is the distance from your directrix to your vertex so a=3. now just plug in to the standard form for the equation of a parabola: 4ax = y^2
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