What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Which doors are open?
Inner product of two vectors
06 - Matrix Equations 2
Determine the length of a string of characters
Remove the positive integers.
Compute LOG(1+X) in natural log
MATLAB Basic: rounding II
Generate vector according to sign of vector
Find out total non zero element of matrix
Case-insensitive Character Detection
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