lashaestone
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1 question!

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

(x+5)^2=2(y+5)

(x+5)^2=8(y+5)

(x+5)^2=4(y+2)

(x+5)^2=y+2

Respuesta :

this is a parabola which opens upwards 

y - (-3) = sqrt ((y+1)^2 + (x + 5)^2

(y + 3)^2 = y^2 + 2y + 1 + (x + 5)^2
y^2 + 6y + 9 = y^2 + 2y + 1 + (x + 5)^2

(x + 5)^2 =  4y + 8

(x + 5)^2 = 4(y + 2)

Its C

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