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The focus of a parabola is (0, -3) and the directrix is y = 3. What is the equation of the parabola?

y=1/12x^2

y=-1/12x^2

x=-1/12y^2

x=1/12y^2

 Apr 30, 2018

Best Answer 

 #1
avatar+294 
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y=1/12*x^2 ~ Incorrect: Directrix: y=-3

y=-1/12*x^2 ~ CORRECT! Directrix: y=3 | Focus: (0,-3)

x=-1/12*y^2 ~ Incorrect: Directrix: x=3

x=1/12*x^2 ~ Incorrect: Directrix: x=-3

 

Hope that Helps!! :D

 Apr 30, 2018
 #1
avatar+294 
+1
Best Answer

y=1/12*x^2 ~ Incorrect: Directrix: y=-3

y=-1/12*x^2 ~ CORRECT! Directrix: y=3 | Focus: (0,-3)

x=-1/12*y^2 ~ Incorrect: Directrix: x=3

x=1/12*x^2 ~ Incorrect: Directrix: x=-3

 

Hope that Helps!! :D

KennedyPape Apr 30, 2018

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