Final answer:
A polynomial expression that fits the given characteristics is -5x² - 2x + 3.
Step-by-step explanation:
A polynomial expression that meets the given characteristics is:
-5x² - 2x + 3
This polynomial expression is a trinomial because it has three terms. The degree of the polynomial is 2 because the highest power of x is 2. The leading coefficient is -5 because it is the coefficient of the term with the highest power of x.