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# how do you write an equation of a parabola with focus 0,3 and directrix -1?

Update:

directrix : y=-1

Update 2:

@alex

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- alexLv 76 years agoFavorite Answer
directrix -1?

directrix x= -1? or y = -1 ?

P(x,y) on the parabola, focus F

PH is the distance to the directrix

so PF = PH

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