Answer:
a^3-1-a^2+a
(a-1) (a^2+a+1)-a(a-1)
(a-1) (a^2+a+1-a)
(a-1) (a^2+1)
2nd exp
2a^3-2-a^2+a
2(a^3-1)(a^2+1)
2(a-1)(a^2+a+1)-a(a-1)
2(a-1)(a^2+a+1-a)
2(a-1)(a^2+1)
