A =![\left[\begin{array}{ccc}3&1\\-1&2\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26amp%3B1%5C%5C-1%26amp%3B2%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}3&1\\-1&2\end{array}\right]")
find f(A) where f(x) = x^2 - 5x + 7
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Answer is given in the pic.
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