A) 2
B) 3
C) 1
D) 0
Correct Answer: C
Solution :
\[{{a}^{2}}+a+1=0\] \[\Rightarrow \] \[(a-1)({{a}^{2}}+a+1)=0\] \[\Rightarrow \] \[{{a}^{3}}-1=0\] \[\Rightarrow \] \[{{a}^{3}}=1\Rightarrow a=1\] \[\therefore \] \[{{a}^{9}}=1\]You need to login to perform this action.
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