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## anonymous one year ago NEED HELP!!! Derive the equation of the parabola with a focus at (−5, 5) and a directrix of y = -1.

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1. anonymous

@jagr2713

2. anonymous

@iambatman

3. LynFran

|dw:1435020052864:dw|

4. anonymous

I don't get it

5. LynFran

ok since we have focus (-5,5) and directrix at y=-1 note that the directrix and the focus is the same distance away from the vertex so the vertex must have cordinates x=-5 & y=2

6. anonymous

Ok

7. anonymous

Here is the answer choices f(x) = −one fourth x2 f(x) = one fourth x2 f(x) = −4x2 f(x) = 4x2

8. anonymous

@LynFran I Still Need Help I Don't Get It

9. LynFran

i would like to think its $f(x)= -\frac{ x ^{2} }{ 4 }$

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