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A parabola has vertex (0, 0) and focus (3, 0). Its equation is:
Ay² = 12x
By² = 6x
Cx² = 12y
Dy² = 3x
Answer & Solution
Correct answer: A. y² = 12x
The focus on the positive x-axis gives a = 3, hence y² = 4ax = 12x.
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