a) 6x² - 5x = 6x * x - 5 * x = (6x - 5)*x

b) 49y² + 14y = 7y * 7y + 7y * 2 = 7y(7y + 2)

c) 9n² - 6n = 3n * 3n - 3n * 2 = 3n(3n - 2)

d) 8t² + 6t + 2 = 2 * 4t² + 2 * 3t + 2 * 1 = 2(4t² + 3t + 1)