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anonymous
 one year ago
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anonymous
 one year ago
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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1take any point on the parabola (x0,y0) then the distance between this point and the focus is given by sqrt[(x0  2)^2 + (y0  0)^2 and distance of the point from the directrix = 12

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1 sorry that distance from directrix is y0  12

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1so as the distance from the focus = distance from the directrix ( definition of a parabola) we have sqrt[(x0  2)^2 + (y0  0)^2 = (0 12) simplify this to get the required equation

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1sorry  another typo its sqrt[(x  2)^2 + (y  0)^2] = (y 12)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1 I change x0 and y0 to x and y

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1squaring both sides (x  2)^2 + y^2 = (y  12)^2 x^2  4x + 3 + y^2 = y^2  24y + 144 can you continue from here?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Could you go all the way please?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0gave you best response

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1x^2  4x + 4 + y^2 = y^2  24y + 144 x^2  4x  140 = 24y y = (1/24)x^2 + (1/6)x  35/6 = 0

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1I'm making a lot of typos today so I cant guarantee the answer but the method is right!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah its an answer could you help me with one more

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1no sorry gtg right now

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1I'm still not happy with that result

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1AH! the distance for directrix is x  (12) = x + 12 so we have (x  2)^2 + y^2 = y^2 + 24x + 144 x^2  4x + 4 + y^2 = y^2 + 24y + 144 x^2  4x  144 + 4 = 24x y = (1/24)x^2  (1/6)x  144/24 = 0 y = (1/24)x^2  (1/6)x  35/6 = 0 is the correct answer

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0http://openstudy.com/study#/updates/55b3b8b7e4b071e6530e1ca4 \

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1the only problem with that is its not one of the options but I'm sure its correct

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1I'll check with wolfram alpha

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1http://www.wolframalpha.com/input/?i=equation+of+a+parabola+with+focus+%282%2C0%29+and+directrix+y+%3D+12 there you go its correct

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0come over here http://openstudy.com/study#/updates/55b3b8b7e4b071e6530e1ca4

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1so there must be a typo in one of the choices looks like its C  which has 2 plus instead 2 negatives
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