Multiple Choice Questions on If x 1 radic 5 ndash 2 than 2x3 ndash 5x2 ndash 14x ndash 3 ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

If x 1 radic 5 ndash 2 than 2x3 ndash 5x2 ndash 14x ndash 3 ........

Quantitative Aptitude (CGL) Algebra
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    If x = 1/√5 – 2 than 2x3 – 5x2 – 14x – 3 = ?

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    Explanation:

    x = 1 /√5 – 2
    x = √ 5 + 2
    x – 2 = √5
    x2 – 4x + 4 = 5
    x2 – 4x – 1 = 0

    ∴ 2x3 – 5x2 – 14x – 3 = (x2 – 4x – 1) (2x + 3) = 0

    By: Amit Kumar
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