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Question

If (x+1x)=4, find the value of (x2+1x2)

A
14
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B
11
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C
15
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D
19
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Solution

The correct option is A 14

given, x+1x=4

Squaring both sides,

=(x+1x)2=42

=x2+(1x)2+2(x)(1x)=16

=x2+1x2+2=16

=x2+1x2=14



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