What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Times 2 - START HERE
Sorted highest to lowest?
Swap two numbers
Let's get back to school, and create multiplication tables
Find Out sum of principal diagonal element of given matrix
MATLAB Basic: rounding III
Find the 9's Complement
Check that number is whole number
Convert number from given base to other base
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