Answer
$-3x^3+5x+6$
$\text{This is a cubic trinomial.}$
Work Step by Step
To figure the degree of a polynomial, we look at the term with the highest power.
Let us rewrite this expression in terms of descending powers; this means that we are writing the polynomial in standard form:
$-2x^3 - x^3 + 5x + 6$
Let us combine like terms:
$-3x^3 + 5x + 6$
This polynomial is now written in standard form.
In this polynomial, the term $-3x^3$ has the highest power.
A third degree polynomial can be called "cubic."
A polynomial with three terms is called a "trinomial."
There are three terms in this polynomial with the highest term being cubic, so we call it a cubic trinomial.
