SOLUTION: If the directrix of a parabola is y=-2 and its focus is (4,2), what is its vertex?

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Question 191996: If the directrix of a parabola is y=-2 and its focus is (4,2), what is its vertex?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
(4,0) ......equal distance between directrix and focus