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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-1

  • question_answer
    If \[{{a}^{2}}+a+1=0\], then the value of\[{{a}^{9}}\]is of \[{{a}^{9}}\] is

    A)  2                                

    B)  3

    C)  1                      

    D)         0

    Correct Answer: C

    Solution :

    \[{{a}^{2}}+a+1=0\] \[\Rightarrow \]   \[(a-1)({{a}^{2}}+a+1)=0\] \[\Rightarrow \]   \[{{a}^{3}}-1=0\] \[\Rightarrow \]   \[{{a}^{3}}=1\Rightarrow a=1\] \[\therefore \]      \[{{a}^{9}}=1\]


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