Find an invertible matrix $P$ and a diagonal matrix $D$ so that $A=PDP^{-1}$.

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Find an invertible matrix $P$ and a diagonal matrix $D$ so that $A=PDP^{−1}$. Use your answer to find an expression for A$^6$ in terms of $P$, a power of $D$, and $P−1$ in that order.

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Find the eigenvalues and eigenvectors. Eigenvalues will give you the matrix D, vectors P. Then the rest should come easy. Good luck on your test...