Find the characteristic equation of the matrix 𝑨 = 2 1 1 0 1 0 1 1 2 and hence find the matrix 𝑨7 ⒠5𝑨6 + 9𝑨5 ⒠13𝑨4 + 17𝑨3 ⒠21𝑨2 + 21𝑨 ⒠8𝑰.
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