Bonjour,
M = (3x/7 - 1) (2x² - 1) = 3x/7 * 2x² - 3x/7 - 2x² + 1 = 6x³/7 - 2x² - 3x/7 + 1
N = (x/3 - 3/4) (-2x/3 - 2) = -2x²/9 - 2x/3 + x/2 + 3/2 = -2x²/9 - x/6 + 3/2
P = (3x/4 - 3) (2x/3 + 2) = x²/2 + 3x/2 - 2x - 6 = x²/2 - x/2 -6
Q = (5x -2) (3x/4 -3) = 15x²/4 - 15x - 3x/2 + 6 = 15x²/4 - 33x/2 + 6