Question

Derive the equation of the parabola with a focus at (–5, –5) and a directrix of y = 7.

Answer 1

Same problem. Different numbers.

Answer 2

f(x) = – 1/24 (x – 1)^2 – 5 right?

Answer 3

@ganeshie8 can you please check my answer?

Answer 4

Looks perfect!

Answer 5

Thank you! @ganeshie8 :))

Answer 6

hey no, wait

Answer 7

what?

Answer 8

you have swapped x and y coordinates of vertex

Answer 9

you should get :
f(x) = -1/24 (x +5)^2 + 1

Answer 10

ohhh hahah thank you for clarifying that! :)

Answer 11

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+