The product of a binomial and a trinomial is x³ + 3x² - x + 2 x² + 6x - 2. Which expression is equivalent to this product after it has been fully simplified? a x³ + 5x² + 5x-2 b x³ + 2x² + 8x - 2 c x³ + 11x² - 2 d x³ + 10x² - 2