How do you factorize #-9z^2+24z-32# over C?
If by "factorize...over C", you mean the set of complex numbers, then here are the following steps:
Step 1. Set the equation equal to zero
Step 2. Plug the coefficients into the quadratic equation
Step 3. Simplify
Step 3. Break into two parts
Step 4. Multiply these terms together for the final answer