What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Finding Perfect Squares
Insert zeros into vector
Determine the length of a string of characters
Remove the Zero
Speed of car
Find out sum of prime number till given number
find out eigenvector of matrix
Flip the vector from right to left
Find out total non zero element of matrix
Find out sum and carry of Binary adder
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