3 a + a - 2
a^3 + a - 1*2
/ ___\ / ___\ | 1 I*\/ 7 | | 1 I*\/ 7 | 1*(a - 1)*|a + - + -------|*|a + - - -------| \ 2 2 / \ 2 2 /
((1*(a - 1))*(a + (1/2 + i*sqrt(7)/2)))*(a + (1/2 - i*sqrt(7)/2))
/ 2\ (-1 + a)*\2 + a + a /
(-1 + a)*(2 + a + a^2)
-2.0 + a + a^3