Multiple Choice Questions on If x radic 3 radic 4 radic 5 than x4 ndash 8x3 8x2 32x ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

If x radic 3 radic 4 radic 5 than x4 ndash 8x3 8x2 32x ........

Quantitative Aptitude (RRB NTPC) Algebra
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    If x = √3 + √4 + √5 than x4 – 8x3 + 8x2 + 32x = ?

    36

    Incorrect Answer

    29

    Incorrect Answer

    44

    Correct Answer

    52

    Incorrect Answer
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    Explanation:

    x = √3 + √4 + √5
    x – 2 = √3 + √5
    x2 – 4x + 4 = 8 + 2 √15
    x2 – 4x – 4 = 2√15
    x4 + 16x2 + 16 – 8x3 + 32x – 8x2 = 60
    x4– 8x3 + 8x2 + 32x = 44

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