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For the first one I have got -28 and 11 as the answer but for the matrix C I am not able to get the value of element c32.

c31 = c33 = 6.

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Sum of eigen values = trace of the matrix

Product of eigen matrix = determinant of the matrix

yes, for matrix A, values will be -28, 11 and for matrix C, values will be 6, x, 6  where x can be any real number.

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