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Question

What is (x+1x)2?



Your Answer
A

x21x2+2

Your Answer
B

x2+1x22

Correct Answer
C

x2+1x2+2

Your Answer
D

None of the above


Solution

The correct option is D

x2+1x2+2


We have the identity:
(a+b)2=a2+b2+2ab
(x+1x)2=x2+(1x)2+2×x×1x
=x2+1x2+2

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