3 a + 27
a^3 + 27
/ ___\ / ___\ | 3 3*I*\/ 3 | | 3 3*I*\/ 3 | 1*(a + 3)*|a + - - + ---------|*|a + - - - ---------| \ 2 2 / \ 2 2 /
((1*(a + 3))*(a - (3/2 + 3*i*sqrt(3)/2)))*(a - (3/2 - 3*i*sqrt(3)/2))
/ 2 \ (3 + a)*\9 + a - 3*a/
(3 + a)*(9 + a^2 - 3*a)
27.0 + a^3