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Question

The equation of the directrix of a parabola 2x2=14y is equal to


A

y=-74

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B

x=-74

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C

y=74

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D

x=74

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Solution

The correct option is A

y=-74


Find the equation of directrix

Given: Equation of the parabola is 2x2=14y

x2=7y

Comparing x2=7y with the equation of a parabola x2=4ay.

4ay=7y

a=74

Equation of directrix of a parabola is y=-a

equation of directrix of the given parabola is y=-74

Hence, Option ‘A’ is Correct.


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