Question:
If $A=\left[\begin{array}{ll}2 & 3 \\ 1 & 2\end{array}\right]$ and $f(x)=x^{2}-4 x+1$, find $f(A)$
Solution:
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If $A=\left[\begin{array}{ll}2 & 3 \\ 1 & 2\end{array}\right]$ and $f(x)=x^{2}-4 x+1$, find $f(A)$