What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Increment a number, given its digits
Back to basics 9 - Indexed References
Matlab Basics II - Free Fall
Skip by a multiple
MATLAB Basic: rounding III
Number of Flip Flop required in ripple counter
find out eigenvector of matrix
Find out next state (NS) of T Flip-Flop.
Transpose of matrix
Find out sum of prime number till given number
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