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Question

If x+1x=3, find the value of x2+1x2 :

A
47
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B
37
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C
57
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D
67
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Solution

The correct option is A 47
x+1x=3
Squaring both sides,
x+1x+2=9

x+1x=7
Again, squaring both sides,
x2+1x2+2=49

x2+1x2=47

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