Because a (a ^ 2 + 2A + 3) = a ^ 3 + 2A ^ 2 + 3a, factorization a ^ 3 + 2A ^ 2 + 3A = ()

Because a (a ^ 2 + 2A + 3) = a ^ 3 + 2A ^ 2 + 3a, factorization a ^ 3 + 2A ^ 2 + 3A = ()

a(a+2)(a+1)