Simple function g of smallest

Question

Give a big-O estimate for each of these functions. For the function g in the estimate F(x) is O(g(x)), use a simple function g of smallest order.

1. (n³ + n²log n) (log n + 8) + (2 log n +3) (n³ + 3)

2. (4ⁿ + n⁴) (n² + 2ⁿ)

3. (nⁿ + n(9ⁿ) + 8ⁿ) (n! + 8ⁿ⁾