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OpenStudy (katherinesmith):
What is the equation of a parabola with a vertex at (1, -1) and a directrix y = 4.
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OpenStudy (dumbcow):
|dw:1380693325190:dw| \[y = a(x-1)^{2} -1\] \[a = -\frac{1}{4p}\]
OpenStudy (katherinesmith):
thats not any of my choices
OpenStudy (dumbcow):
haha well do you understand what i did? what value did you plug in for "p" ?
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