Answer:f(3x - 1) = 9x² - 12x + 9Step-by-step explanation:f(x) = x² - 3x + 5f(3x - 1) = (3x - 1)² - 3(3x - 1) + 5 = (3x - 1)(3x - 1) - 3(3x - 1) + 5 = 9x² - 3x - 3x + 1 - 6x + 3 + 5 = 9x² - 6x + 1 - 6x + 3 + 5 = 9x² - 6x + 1 - 6x + 8 = 9x² - 6x - 6x + 1 + 8f(3x - 1) = 9x² - 12x + 9