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Question

If x2−3x+1=0, then the value of x2+1x2 is

A
3
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B
0
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C
5
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D
7
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Solution

The correct option is D 7
Given eq. is x23x+1=0

x2+1=3x

x+1x=3

squaring both sides , we get

x2+1x2+2=9

x2+1x2=7

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