J = (3x - 4) X (5x - 8)
J = 15x² - 24x - 20x + 32
J = 15x² - 44x + 32.
S = 4x (3x - 9) + 8x - 4x² - 9
S = 12x² - 36x + 8x - 4x² - 9
S = 8x² - 28x - 9
C = -4x (2x - 3) - (5x + 2) X 3
C = -4x (2x - 3) - [3 (5x + 2)]
C = -8x² + 12x - (15x + 6)
C = -8x² + 12x - 15x - 6
C = -8x² - 3x - 6
J'espère t'avoir aidé !
