What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Project Euler: Problem 1, Multiples of 3 and 5
Reverse the elements of an array
Output any real number that is neither positive nor negative
Sum of the Multiplication of Vectors
MATLAB Basic: rounding
Find out Binomial coefficient
Do operation as per given string
Find Excess 3 code of given decimal number.
Convert to Binary Coded Decimal
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