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andrey2020 [161]
3 years ago
9

The focus of a parabola is (−5,−1) and the directrix is y=−3.

Mathematics
1 answer:
Bingel [31]3 years ago
8 0
(x+5)^2=4(y+2)

the equation for a parabola with focus (h, k+p) and directrix y=k-p is 
(x-h)^2=4p(y-k)

so using your directrix y=-3, and knowing directrix is y=k-p, you have 
-3=k-p.
similarly, knowing the focus is defined by (h,k+p) and your focus is (-5,-1)
you have the equation -1=k+p.

you now have a system of equations
-3=k-p \\ -1=k+p
which you can solve using any method, I will use elimination.
adding down
-4=2k \\ -2=k
you now have k and can find p using either equation. 
-3=k-p \\ -3=-2-p \\ -1=-p \\ 1=p.

now you plug those in, getting the answer
(x+5)^2=4(y+2)
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