Which description is correct for the polynomial 3x3+4x2-7?

quadratic trinomial

cubic binomial

quartic trinomial

cubic trinomial

This would be a Cubic Trinomial; The number of terms are 3 and the degree is 3.

Cubic trinomial

Step-by-step explanation:

The first word expresses the maximum exponent of our polynomial. In this case, cubic means that our variable (x) has, as higher degree, 3. If the highest degree would have been 2, we say we have a quadratic polynomial. Quartic doesnt exist.

The second term refers to the number of independent expressions that constitute our function. In the example, we have 3 expressions 3x^3, 4x^2 and - 7. As there are three expressions, we say that the polynomial is a trinomial. If the expression had only two terms it would be a binomial.