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OpenStudy (anonymous):
Find the equation for a parabola with its focus at (0, -3) and a directrix of y = 3.
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OpenStudy (shinalcantara):
|dw:1410555641766:dw|
OpenStudy (shinalcantara):
since the parabola opens downward, so we'll expect that x is quadratic and y is linear. the formula would be (x-h)^2=4a(y-k) using the graph, identify the vertex (h,k) and the value of a, then you'll have your equation
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