What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Vectorize the digits of an Integer
Given a matrix, swap the 2nd & 3rd columns
Let's get back to school, and create multiplication tables
Largest Prime Number
Check that number is whole number
Add two hex numbers
Number of Flip Flop required in ripple counter
Convert given decimal number to binary number.
Find out base of following arithmetic operation
Convert Decimal Number to Hex number (including non integer value)
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