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Suppose that a matrix A has the characteristic polynomial ( -1)^3*(a* + ^2+b) for some a , b R . If the trace of A

Suppose that a matrixAhas the characteristic polynomial (-1)^3*(a*+^2+b)for somea,bR.If the trace ofAis 13 and the determinant ofAis 21, find all eigenvalues ofA.

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