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20 February, 19:37

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

+5
Answers (1)
  1. 20 February, 23:11
    0
    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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