Question

Factor a3 - 3 + 3a2 - a.

Answer 1

First rearrange it in descending order:
a^3 + 3a^2 - a - 3
Then factor by grouping.
a^2(a + 3) - (a + 3)
(a^2 - 1)(a + 3)
Then, factor a^2 - 1 using the difference in squares pattern.
(a + 1)(a - 1)(a + 3)

Answer 2

thanks