What do you call a product of a square of a binomial?

This is the concept of polynomial equations. Suppose we are given the binomial equations;
(a+b)^2
=(a+b)(a+b)
=a^2+2ab+c^2
The above answer is a trinomial, from this we can deduce that the square of a binomial is always a trinomial

It’s going to be d. 4x^2-4x-19’