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Question

If x+1x=2, then x3+1x3=


A

64

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B

14

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C

8

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D

2

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Solution

The correct option is D

2


x+1x=2,Cubing, we getx3+1x3+3(x+1x)=(2)3 x3+1x3+3(2)=8x3+1x3=86=2


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