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Question

If the line x-3y+k =0 touches the parabola 3y2=4x then the value of k is


A

5

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B

7

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C

6

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D

3

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Solution

The correct option is D

3


x3y+k=03y2=4x3y=x+ky2=43xy=13x+k3a=13c=amk3=1313=1k=3


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