What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Replicate elements in vectors
Change the sign of even index entries of the reversed vector
find the roots of a quadratic equation
Min of a Matrix
Sum of diagonals elements of a matrix
Add two hex numbers
Find Excess 3 code of given decimal number.
Find out output of following expression
Find out Binomial coefficient
Find out DC Gain of transfer function
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