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Standard form of a parabola with a vertex and directrix
Asked Nov 22, 2010, 04:21 PM
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1 Answer Write the standard form of the parabola with its vertex at (0,0) at te origin and directrix x= -3 |
1 Answer
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| Since the directrix is at x=-3, the parabola open toward the positive x-axis and has the equation The distance from the vertex to the directrix is the same as the distance from the vertex to the focus. P is this distance in the above equation. We can easily see that p=3. Plug in p=3: That's it. There are many parabola-related posts on this site. Do a search. | ||||
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