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Question

The focal distance of a point on the parabola y2=8x is 10. Its coordinates are


A

(2,±2)

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B

(3,±3)

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C

(5,±5)

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D

(8,±8)

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Solution

The correct option is D

(8,±8)


y2=8x4a=8a=2
x1+a=10
x1=8y21=8×8=82y1=±8
(x1y1)=(8,±8)


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