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
1493 Solvers
Reverse the elements of an array
687 Solvers
Output any real number that is neither positive nor negative
316 Solvers
168 Solvers
Sum of the Multiplication of Vectors
202 Solvers
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