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Home Q & A Board Science-Related Homework Help Mathematics
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Leo Leo
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11 years ago
The equation is (x-4)^2 = 8(y+3). I found the vertex to be (4,-3). How do I find the rest?
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wrote...
#1
11 years ago
4a = 8
a = 2

directrix:  y = -3 - 2 = -5
wrote...
#2
11 years ago
(x - h)² = 4p(y - k)²

vertex(you knew) = (h, k)
p = distance between vertex and focus; distance between vertex and directrix

parabola opens up, so focus is point p units above vertex, directrix is horizontal line p units below vertex
F: (4, -1)
d: y = -5
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