Answer:
a 2nd degree trinomial
Explanation:
First, this polynomial has 3 terms which are 4x^2, 8n, and 16. This makes this polynomial a trinomial.
Second, the highest degree in this polynomial is a degree of 2 because of the term 4x^2. This makes this polynomial a 2nd degree polynomial.
Lastly, when you put all of this together you get a 2nd degree trinomial.