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OpenStudy (anonymous):
The equation for the directrix of this parabola is x = -12. x^2=12y A. True B. False
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OpenStudy (dumbcow):
False y = x^2/12 --> directrix is horizontal line
OpenStudy (campbell_st):
a = 3 vertex is (0, 0) so the directrix is x = -a focal length from the vertex
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