Multiple Choice Questions on x 1 x 3 x 4 1 x 4 1 Simplify the equation and find it 39 s value ........ for CDS Exam Preparation

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Multiple Choice Questions

x 1 x 3 x 4 1 x 4 1 Simplify the equation and find it 39 s value ........

Quantitative Aptitude (CDS) Simplification
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    x+1/x =3 ,(x^4 +1/x^4 ) -1 Simplify the equation and find it's value ?

    23

    Incorrect Answer

    47

    Incorrect Answer

    46

    Correct Answer

    20

    Incorrect Answer
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    Explanation:

    (X+1/x)^2
    =x^2 +1/x^2  +2
    (3)^2  =x^2  +1/x^2   +2
    x^2  +1/x^2   =7 .....  equation 1
    taking square of equation 1
    (x^2  +1/x^2 )^2 =(7)^2
    X^4  +1/x^4   +2 =49
    X^4  +1/x^4 =47
    47-1 =46

    By: bhavesh kumar singh
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