Multiple Choice Questions on The HCF of x2 ndash 3x ndash 4 and 9 ndash x2 is ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

The HCF of x2 ndash 3x ndash 4 and 9 ndash x2 is ........

Quantitative Aptitude (RRB NTPC) LCM, HCF
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    The HCF of (x2 – 3x – 4) and (9 – x2) is:

     

    (3 – x2) (x + 1)

    Incorrect Answer

    (3 + x)

    Incorrect Answer

    (x – 3) (x + 1)

    Incorrect Answer

    None of these

    Correct Answer
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    Explanation:

    Ans (d): x 2 – 3x – 4 = (x – 4) (x + 1)
    and 9 – x2 = 32 – x2 = (3 – x) (3 + 1)
    So, HCF of both = 1.
    Hence the correct option is (d).



     

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