Answer:
Given\[A=\left[ \begin{matrix} 0 \\ 0 \\ \end{matrix}\,\,\,\begin{matrix} a \\ 0 \\ \end{matrix} \right]\], then \[{{A}^{2}}=\left[ \begin{matrix} 0 \\ 0 \\ \end{matrix}\,\,\,\begin{matrix} a \\ 0 \\ \end{matrix} \right]\left[ \begin{matrix} 0 \\ 0 \\ \end{matrix}\,\,\,\begin{matrix} a \\ 0 \\ \end{matrix} \right]=\left[ \begin{matrix} 0 \\ 0 \\ \end{matrix}\,\,\,\begin{matrix} 0 \\ 0 \\ \end{matrix} \right]=O\] \[\Rightarrow \] \[{{A}^{2}}={{({{A}^{2}})}^{8}}=O\]
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