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OpenStudy (anonymous):
directrix:y=-4,focus:(0,4)
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Directrix (directrix):
|dw:1328419936695:dw| (x - 0)^2 = 16 (y - 0) x^2 = 16y y = (1/16) (x ^ 2) See link below for more about parabolas. http://www.purplemath.com/modules/parabola3.htm
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