By inspection, a3 - 2a2 + a - 2 gives
(a2 + 1) (a + 2)
(a - 2) (a2 + 1)
(a - 2) (a2 - 1)
a(a2 - 2a + 1)
a3 - 2a2 + a - 2 = a2 (a - 2) + (a - 2)
= (a2 + 1) (a - 2)
By inspection, 4 (x - y)3 + 6 (x - y)2 gives
By inspection, 9 (2a - 3b)2 - 12 (2a - 3b) gives