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Apply Cayley-Hamilton theorem for $A = \begin{bmatrix} \ 1 & 2 \\ \ 2 & -1 \\ \end{bmatrix}$ and deduce that $A^8=625I$
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Given,

$A = \begin{bmatrix} \ 1 & 2 \\ \ 2 & -1 \\ \end{bmatrix}$


To Prove :- $A^8 = 625I$


Proof :-

$A = \begin{bmatrix} \ 1 & 2 \\ \ 2 & -1 \\ \end{bmatrix}$

The characteristic equation of A will be |A - λI| = 0

$\implies …

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