What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Given a window, how many subsets of a vector sum positive
Sum the Digits of a Number
Average speed for the entire trip
Determine the mean of matrix
Convert number from given base to other base
Find out DC Gain of transfer function
Flip the vector from right to left
Create an anti-identity matrix
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