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Question

Ifx+1x=5,then(x3+1x3)5(x2+1x2)+(x+1x) is equal to



Correct Answer
A

0

Your Answer
B

5

Your Answer
C

-5

Your Answer
D

10


Solution

The correct option is D

0


(x3+1x3)5(x2+1x2)+(x+1x)=(x+1x)33(x+1x)5[(x+1x)22]+(x+1x)=(x+1x)35(x+1x)22(x+1x)+10=1251252(5)+(10)=0

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