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Directrix

If x+k=0 is e...

Question

If x+k=0 is equation of directrix to parabola $y^{2} = 8 (x + 1)$ then k =

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is C 3
Directrix of $Y^{2} = 4 A X$ is X+A = 0.
A = 2 and X = x+1
=> Directrix is x+1+ 2 = 0
=> k = 3

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