What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Set the array elements whose value is 13 to 0
Volume of a sphere given its surface area
Celsius to Kelvin
Try 1.5.4: Celsius to Fahrenheit
Your favourite city!
Find the 9's Complement
Change the first and last diagonal element of the identity matrix to zero
Flip the vector from right to left
MATLAB Basic: rounding IV
Create an anti-identity matrix
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