acantr3ll acantr3ll

20-05-2018
Mathematics

contestada

what are the focus and directrix of the parabola with the equation y=1/16x^2

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CastleRook CastleRook

29-05-2018

y=1/16x^2
multiplying both sides by 16 we get:
16y=x^2
The general form of a parabola is:
(x-h)^2=4p(y-k)
thus
4p=16
p=4
The parabola opens upwrd:
Focus: (h,k-p)
(0,0-4)
=(0,-4)
Directrix: y=-4

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