In Problems 9-16, find the indicated matrices, if possible. [[mathrm{A}]=left[begin{array}{rr}1 & 2 4 & 0 -1 &

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In Problems 9-16, find the indicated matrices, if possible.

\[[\mathrm{A}]=\left[\begin{array}{rr}1 & 2 \\4 & 0 \\-1 & 3 \\2 & 1 \end{array}\right] \quad[\mathrm{B}]=\left[\begin{array}{rr}4 & 2 \\-1 & 3\end{array}\right]\]\[\begin{array}{lll}{[\mathrm{C}]=\left[\begin{array}{llll}1 & 0 & 0 & 0 \\0 & 1 & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & 1 \end{array}\right]} & {[\mathrm{D}]=\left[\begin{array}{rrrr}4 & 1 & 3 & 6 \\
-1 & 0 & -2 & 3 \end{array}\right]} \\{[\mathrm{E}]=\left[\begin{array}{rrr}1 & 0 & 2 \\3 & -1 & 2 \\4 & 1 & 0 \end{array}\right]} & {[\mathrm{F}]=\left[\begin{array}{rrr}
1 & 4 & 0 \\3 & -1 & 2 \\-2 & 1 & 5 \end{array}\right]} \\{[\mathrm{G}]=\left[\begin{array}{rrr}
8 & 1 & 6 \\3 & 5 & 7 \\4 & 9 & 2 \end{array}\right]} &\end{array}\]

a. \([\mathrm{B}]^{2}\)

b. \([\mathrm{C}]^{3}\)

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