Name : Trinomial.
Degree : 4
Step-by-step explanation
Monomial : A polynomial with just one term.
Binomial : A polynomial with two terms.
Trinomial : A polynomial with three terms.
From the question given;
(12x⁴ + 3x - 1) comprises of 3 terms, hence it is a trinomial.
The degree of a polynomial is the highest exponent in a term of a polynomial.
Hence, the highest exponent in the given expression is 4, this implies that the polynomial is of degree 4.