Multiple Choice Questions on The expression 2x3 x2 ndash 2x ndash 1 is divisible by ........ for Graduation cum Career Security Preparation

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Multiple Choice Questions

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

Quantitative Aptitude (CCS) 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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