SOLUTION: How do you write the standard form of the parabola given directrix (x=3) and vertex (0,0)?

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Question 194432: How do you write the standard form of the parabola given directrix (x=3) and vertex (0,0)?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
1/4a=3
:
12a=1
:
a=1/12
:
x=(1/12)y^2