Multiple Choice Questions on If x2 3x 1 0 then what is the value of x2 1 x2 ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

If x2 3x 1 0 then what is the value of x2 1 x2 ........

Quantitative Aptitude (RRB NTPC) Algebra
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    If x2-3x + 1= 0 then what is the value of (x2+ 1/x2)

    3

    Incorrect Answer

    5

    Incorrect Answer

    7

    Correct Answer

    9

    Incorrect Answer
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    Explanation:

    x2-3x + 1= 0
    or x2+ 1= 3x
    or x+1/x= 3
    on squaring both sides
    (x+1/x)2=9
    (x2+ 1/x2)=9-2=7

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