P1. $2X^{5}+X = \left(\begin{array}{ccc}3&5&0\\5&1&9\\ 0&9&0\end{array}\right)$
P2. $X^{3} = \left(\begin{array}{ccc}0&0&0\\1&0&0\\ 2&3&0\end{array}\right)$
P3. $X^{4} = \left(\begin{array}{ccc}3&4&0\\ 0&3&0\\ 0&0&-3\end{array}\right)$
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