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OpenStudy (anonymous):
how would i solve an equation that has a directrix.solving those is confusing to me
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OpenStudy (anonymous):
an example of this is Derive the equation of the parabola with a focus at (2, −1) and a directrix of y = −\[\frac{ -1 }{ -2 }\]
OpenStudy (anonymous):
the y=-1/2
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