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What is the equation of the parabola, in vertex form, with focus at (2,-4) and directrix y = -6? A. (y+4)^2=-4(x-2) B. (x-2)^2=-1/4(y+5) C. (x+2)^2=1/4(y+4) D. (x-2)^2=4(y+5)
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