Answer: 9x^2 + 15x - 50
Step-by-step explanation:
To express as a trinomial, you will have to expand the expression using FOIL, where you multiply the first of each part in parenthesis (3x * 3x = 9x^2), outside (3x * -5 = -15x), inside (10 * 3x = 30x), and last (10 * -5 = -50), and add them all up. (9x^2 -15x + 30x - 50, or 9x^2 + 15x - 50)
