Answer:
![2x^3-2x^2-4x](https://img.qammunity.org/2020/formulas/mathematics/high-school/htj1bzr2kwz02csaneqssq13jhwyw3xfig.png)
Explanation:
A cubic is an algebraic expression whose highest degree or exponent is 3 on the variable. A trinomial is an algebraic expression which is composed of three terms separated by addition or subtraction. When an expression meets both conditions, it is a cubic trinomial.