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Multiple Choice Questions

The expression 2x3 x2 ndash 2x ndash 1 is divisible by ........

Quantitative Aptitude and Numerical Ability (DRDO) (Phase-i and II) Algebra
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    The expression 2x3 + x2 – 2x – 1 is divisible by
    x + 2
    Incorrect Answer
    2x + 1
    Correct Answer
    x – 2
    Incorrect Answer
    2x – 1
    Incorrect Answer
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    Explanation:

    Let f(x) = 2x3 + x2 – 2x – 1
    = x2(2x + 1) – 1(2x + 1)
    = (x2 – 1)(2x + 1)
    = (2x + 1)(x + 1)(x – 1)

    By: Amit Kumar
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