A = \left[ \begin{array} { c c } { - 1 } & { 2 } \\ { 3 } & { 1 } \end – InterviewSolution

1.	A = \left[ \begin{array} { c c } { - 1 } & { 2 } \\ { 3 } & { 1 } \end{array} \right] , \text { find } f ( A ) , \text { where } f ( x ) = x ^ { 2 } - 2 x + 3
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