4 x - 9
x^4 - 1*9
/ ___\ / ___\ / ___\ / ___\ 1*\x + \/ 3 /*\x - \/ 3 /*\x + I*\/ 3 /*\x - I*\/ 3 /
(((1*(x + sqrt(3)))*(x - sqrt(3)))*(x + i*sqrt(3)))*(x - i*sqrt(3))
-9.0 + x^4
/ 2\ / 2\ \-3 + x /*\3 + x /
(-3 + x^2)*(3 + x^2)