j'ai besoins d'aide s'il vout plait ☺

Bonjour,

A = 4x (3x + 6)
A = 12x² + 24x

B = 2 (x + 3) + 4 (5x - 1)
B = 2x + 6 + 20x - 4
B = 2x + 20x + 6 - 4
B = 22x + 2

C = (x - 1) (x - 2) + (x - 5) (x - 3)
C = x² - 2x - x + 2 + x² - 3x - 5x + 15
C = x² + x² - 2x - x - 3x - 5x + 2 + 15
C = 2x² - 11x + 17

D = (x - 1) (x - 2) - (x - 5) (x - 3)
D = x² - 2x - x + 2 - (x² - 3x - 5x + 15)
D = x² - 2x - x + 2 - x² + 3x + 5x - 15
D = x² - x² - 2x - x + 3x + 5x + 2 - 15
D = 5x - 13

E = (3x - 4)²
E = 9x² - 24x + 16

F = (7x + 6) (7x - 6)
F = 49x² - 42x + 42x - 36
F = 49x² - 36