4 x + 16
x^4 + 16
/ ___ ___\ / ___ ___\ / ___ ___\ / ___ ___\ \x + \/ 2 + I*\/ 2 /*\x + \/ 2 - I*\/ 2 /*\x + - \/ 2 + I*\/ 2 /*\x + - \/ 2 - I*\/ 2 /
(((x + sqrt(2) + i*sqrt(2))*(x + sqrt(2) - i*sqrt(2)))*(x - sqrt(2) + i*sqrt(2)))*(x - sqrt(2) - i*sqrt(2))
16.0 + x^4