precalculus
posted by Hawra on .
form a polynomial f(x) with real coefficients having the given degree and zeros.
degree: 4; zeros: 1, 2, and 12i.
I got an exam tomorrow, i would appreciate any kind of help, thank you.

You are given 2 real roots and one complex.
As I noted before, complex numbers come in pairs,
so there has to be another one, 1+2i
so we have
f(x) = (x+1)(x2)(x12i)(x1+2i)
multiply the last two brackets, the i's will drop out 
thank you again, life saver