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Question

The length of the latus-rectum of the parabola x24x8y+12=0 is


A

4

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B

6

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C

8

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D

10

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Solution

The correct option is C

8


Given : x24x8y+12=0

(x2)28y+8=0

(x2)2=8y8=8(y1)

Let X=x-2,Y=y-1

X2=8Y

Length of the latus rectum=4a=8 units


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