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OpenStudy (vera_ewing):
Derive the equation of the parabola with a focus at (–5, –5) and a directrix of y = 7.
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OpenStudy (mertsj):
Same problem. Different numbers.
OpenStudy (vera_ewing):
f(x) = – 1/24 (x – 1)^2 – 5 right?
OpenStudy (vera_ewing):
@ganeshie8 can you please check my answer?
ganeshie8 (ganeshie8):
Looks perfect!
OpenStudy (vera_ewing):
Thank you! @ganeshie8 :))
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ganeshie8 (ganeshie8):
hey no, wait
OpenStudy (vera_ewing):
what?
ganeshie8 (ganeshie8):
you have swapped x and y coordinates of vertex
ganeshie8 (ganeshie8):
you should get : f(x) = -1/24 (x +5)^2 + 1
OpenStudy (vera_ewing):
ohhh hahah thank you for clarifying that! :)
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ganeshie8 (ganeshie8):
np :) you may use wolfram to double check ur answer http://www.wolframalpha.com/input/?i=focus+f%28x%29+%3D+%E2%80%93+1%2F24+%28x+%2B5%29%5E2+%2B1+
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