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Question

If x=3+22, then the value of (x1x) = .

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 2
(x1x)2=x+1x2

Given, x=3+22

Substituting the value of x in x+1x2,

(3+22)+1(3+22)2

= 3+22+322(3+22)(322)2

= 3+22+322982

= 3+22+32212

= 3+22+3222

=62

= 4
Since, (x1x)2=4,(x1x)=2 .

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