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A parabola has its focus at (-4,0) and i...

A parabola has its focus at (-4,0) and its directrix is `x=4 .` Its equation is

A

`x^(2)=-8 y`

B

`y^(2)=-16 x`

C

`x^(2)=9 y`

D

`y^(2)=8 x`

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The correct Answer is:
B
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