compute the characteristic polynomial of a matrix
matrix, vector, array, or scalar
The function poly(A,x) returns the characteristic polynomial in x that has the eigenvalues of the matrix A as its roots (all multiplicities respected).
This polynomial is the determinant of x*I - A, where I is the identity matrix with the dimension of A.
If the parameter x is omitted, then the name x is used.
A ≔ Matrix⁡1,2,1,2,4,2,2,8,1
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