Factorization of a ^ 3 + 3A ^ 2-2a-6

Factorization of a ^ 3 + 3A ^ 2-2a-6

a^3+3a^2-2a-6
=(a^3+3a^2)-(2a+6)
=a²(a+3)-2(a+3)
=(a+3)(a²-2)
=(a + 3) (a + radical 2) (a-radical 2)