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undeadknight26 (undeadknight26):
How would you find the focal length of this? Derive the equation of the parabola with a focus at (-2, 4) and a directrix of y = 6. Put the equation in standard form.
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OpenStudy (perl):
we can use ( x - h)^2 = 4p* ( y - k )
undeadknight26 (undeadknight26):
sooo: (-2 - h)^2 = 4p*(4 - k)?
OpenStudy (perl):
not quite
undeadknight26 (undeadknight26):
hmmmm.. Would it not be negative then?
OpenStudy (perl):
the distance from the focus to the directrix is 2|p|
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OpenStudy (perl):
|dw:1415199170267:dw|
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