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Let I=I2I = I _ { 2 } Be the Identity Matrix of Order 2, and Let

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Let I=I2I = I _ { 2 } be the identity matrix of order 2, and let f(x) =AxIf ( x ) = | A - x I | . Find the polynomial f(x) f ( x ) for the given matrix A in order to find the zeros of f(x) f ( x ) .
(In the study of matrices, f(x) f ( x ) is the characteristic polynomial of A, and the zeros of f(x) f ( x ) are the characteristic values (eigenvalues) of A.) A=[37901229]A = \left[ \begin{array} { r r } 37 & - 90 \\12 & - 29\end{array} \right]


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