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Mathematics 12 Online
OpenStudy (anonymous):

The equation for the directrix of this parabola is x = -12. x^2=12y A. True B. False

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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