Find the solution of the equation x3-2x2-3x in z12
First let us factorize this polynomial :
The obvious solutions are (as in ). However, as contains the zero divisors, there could possibly be other solutions.
and thus if is a solution of this equation, we should have or (as the condition is equivalent to ). Therefore, the other possible solutions may be
Now we can also see, that if is even, then are odd and thus if is a solution and it is even, it should be divisible by 4. However, if is odd, then both are even, so their product is divisible by 4. These conditions yield that the solution set is
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