Multiple Choice Questions on If a3 3a2 9a 1 then what is the value of a3 3 a ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

If a3 3a2 9a 1 then what is the value of a3 3 a ........

Quantitative Aptitude (CGL) Algebra
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    If a3 + 3a2 + 9a = 1, then what is the value of a3 + (3/a)?

    31

    Incorrect Answer

    26

    Incorrect Answer

    28

    Correct Answer

    24

    Incorrect Answer
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    Explanation:

    From (a^3+3a^2+9a=1)we can get the value of both a^3 & 3/a.
    So, a^3=1-3a^2-9a
    & a(a^2+3a+9)=1
    or, a×3(a^2+3a+9)=3
    or,3/a=3a^2+9a+27
    Now, a^3+3/a=1-3a^2-9a+3a^2+9a+27. or a^3+3/a=1+27=28(ans)

    By: MIRZA SADDAM HUSSAIN
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