x^3 - x^2 + x - 1 factors as
x^2 (x -1) + 1(x - 1) =
(x - 1)(x^2 + 1)
x^2 - 1 factors as
(x + 1) ( x - 1)
Taking all the different factors we have
(x - 1) (x + 1) (x^2 + 1) ⇒ second answer
7 7
____ + ______
a + 8 a^2 - 64
7 7
_____ + __________
a + 8 (a + 8) (a - 8)
7(a - 8) 7
__________ + _________
(a + 8) (a - 8) (a + 8) (a - 8)
[ 7a - 56 + 7 ]
____________
(a + 8) (a - 8)
[ 7a - 49 ]
___________
(a + 8) (a - 8)