The polynomial $16x + 2$ is a binomial because it contains two terms: $16x$ and $2$.

To make it a trinomial, we can add another term. A possible term to add could be, for example, $3x^2$. Therefore, adding $3x^2$ would give us the trinomial:

$3x^2 + 16x + 2$

Would you like further details or have any questions?

Here are 5 related questions to consider:

1. What is the definition of a polynomial?
2. How can you determine the degree of a polynomial?
3. What are the differences between a monomial, binomial, and trinomial?
4. How do you add or subtract polynomials?
5. Can the number of terms in a polynomial affect its classification?

Tip: When identifying a polynomial, count the number of terms first to determine if it's a monomial, binomial, or trinomial.