Q1

MCQ1 mark, −0.33

If $A=\left(\begin{array}{cc}1 & 2 \\ 2 & -1\end{array}\right)$ , then which ONE of the following is $A^{8}$ ?

(A)

$\left(\begin{array}{cc}25 & 0 \\ 0 & 25\end{array}\right)$

(B)

$\left(\begin{array}{cc}125 & 0 \\ 0 & 125\end{array}\right)$

(C)

$\left(\begin{array}{cc}625 & 0 \\ 0 & 625\end{array}\right)$

(D)

$\left(\begin{array}{cc}3125 & 0 \\ 0 & 3125\end{array}\right)$

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