If \[A=\left[ \begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ a & b & -1 \\ \end{matrix} \right]\] and I is the unit matrix of order 3, then \[{{A}^{2}}+2{{A}^{4}}+4{{A}^{6}}\] is equal to

If \[A=\left[ \begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ �

1.	If \[A=\left[ \begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ a & b & -1 \\ \end{matrix} \right]\] and I is the unit matrix of order 3, then \[{{A}^{2}}+2{{A}^{4}}+4{{A}^{6}}\] is equal to
A.	\[7{{A}^{8}}\]
B.	\[7{{A}^{7}}\]
C.	8I
D.	6I
Answer» B. \[7{{A}^{7}}\]

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If \[A=\left[ \begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ a & b & -1 \\ \end{matrix} \right]\] and I is the unit matrix of order 3, then \[{{A}^{2}}+2{{A}^{4}}+4{{A}^{6}}\] is equal to

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