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anonymous
 one year ago
What is the equation of a parabola with a vertex at (1, 1) and a directrix y = 4.
anonymous
 one year ago
What is the equation of a parabola with a vertex at (1, 1) and a directrix y = 4.

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muscrat123
 one year ago
Best ResponseYou've already chosen the best response.0and i do not know this

freckles
 one year ago
Best ResponseYou've already chosen the best response.1\[(xh)^2=4p(yk) \\ \text{ where the vertex is } (h,k) \]

freckles
 one year ago
Best ResponseYou've already chosen the best response.1p's sign is based on whether the vertex is above the directrix or below the directrix if the vertex is above the directrix, then p is positive. if the vertex is below the directrix, then p is negative.

freckles
 one year ago
Best ResponseYou've already chosen the best response.1now the other thing p has going for it .. is that it is the distance from the vertex to the directrix (or you can say the distance from the vertex to the focus)

freckles
 one year ago
Best ResponseYou've already chosen the best response.1so p tells us two things not just one

freckles
 one year ago
Best ResponseYou've already chosen the best response.1it helps to draw what we are given sometimes... dw:1439673047228:dw so the directrix is above the vertex so p is negative can you tell me how far the directrix is from the vertex

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thx so much, i think the answer is \[y+1= \frac{ 1 }{ 20 }\left( x1 \right)^{2}\]
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