/ ___ 4 ___ ___ 4 ___\ / ___ 4 ___ ___ 4 ___\ / ___ 4 ___ ___ 4 ___\ / ___ 4 ___ ___ 4 ___\
| \/ 2 *\/ 5 I*\/ 2 *\/ 5 | | \/ 2 *\/ 5 I*\/ 2 *\/ 5 | | \/ 2 *\/ 5 I*\/ 2 *\/ 5 | | \/ 2 *\/ 5 I*\/ 2 *\/ 5 |
x*|x + ----------- + -------------|*|x + ----------- - -------------|*|x + - ----------- + -------------|*|x + - ----------- - -------------|
\ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /
$$x \left(x + \left(\frac{\sqrt{2} \sqrt[4]{5}}{2} + \frac{\sqrt{2} \sqrt[4]{5} i}{2}\right)\right) \left(x + \left(\frac{\sqrt{2} \sqrt[4]{5}}{2} - \frac{\sqrt{2} \sqrt[4]{5} i}{2}\right)\right) \left(x + \left(- \frac{\sqrt{2} \sqrt[4]{5}}{2} + \frac{\sqrt{2} \sqrt[4]{5} i}{2}\right)\right) \left(x + \left(- \frac{\sqrt{2} \sqrt[4]{5}}{2} - \frac{\sqrt{2} \sqrt[4]{5} i}{2}\right)\right)$$
(((x*(x + sqrt(2)*5^(1/4)/2 + i*sqrt(2)*5^(1/4)/2))*(x + sqrt(2)*5^(1/4)/2 - i*sqrt(2)*5^(1/4)/2))*(x - sqrt(2)*5^(1/4)/2 + i*sqrt(2)*5^(1/4)/2))*(x - sqrt(2)*5^(1/4)/2 - i*sqrt(2)*5^(1/4)/2)