Sagot :
Bonsoir
A = 2x*4x -2*2x -3*4x + 3*2
A = 8x² - 4x - 12x + 6
A = 8x² - 16x + 6
B = -x*3x -x*7 +8*3x +8*7
B = -3x² - 7x + 24x + 56
B = -3x² + 17x + 56
C = -10x² -4x +20x +8 +3x -12
C = -10x² +19x -4
À toi de faire la dernière
bonne soirée
Bonjour !
A = (2x - 3)(4x - 2)
A = 2x*4x - 3*4x - 2*2x - 3*(-2)
A = 8x² - 12x - 4x + 6
A = 8x² - 16x + 6
B = (-x + 8)(3x + 7)
B = -x*3x + 8*3x - x*7 + 8*7
B = -3x² + 24x - 7x + 56
B = -3x² + 17x + 56
C = (2x - 4)(-5x - 2) + 3(x - 4)
C = 2x*(-5x) - 4*(-5x) - 2*2x - 2*(-4) + 3*x - 4*3
C = -10x² + 20x - 4x + 8 + 3x - 12
C = -10x² + 19x - 4
D = 5x - (-x + 4)(7x - 6)
D = 5x - (-x*7x + 4*7x - x*(-6) - 6*4)
D = 5x - (-7x² + 28x + 6x - 24)
D = 5x + 7x² - 28x - 6x + 24
D = 7x² - 29x + 24
J’espère t'avoir aidé. Bon courage !