and synthetic division.
Descartes Rule of Sign to determine possibilities
What technique is used to find zeros (real and complex) for something like:
f(x) = x³ - 3x² + 12
I know from discriminant that is has two complex roots, and I can estimate real root from graph, but don't know, algebraically, how to find exact answers.
Thanks for any help.
I would not do this by hand myself as that is too error prone, but would use a symbolic mathematics system (Maxima, of Wolfram Alpha are two obvious candidates)