Svp!!exo 1a et b et 3a et b c'est pour demain!!

Bonsoir

1)
A = 2 (3x + 4) + 3 (x - 2)
A = 6x + 8 + 3x - 6
A = 6x + 3x + 8 - 6
A = 9x + 2

B = 4 (x - 5) - 2 (x + 1)
B = 4x - 20 - 2x - 2
B = 4x - 2x - 20 - 2
B = 2x - 18

3)
A = (x + 2) (3x + 4)
A = 3x² + 4x + 6x + 8
A = 3x² + 10x + 8

B = (- 2x + 5) (4x - 3)
B = - 8x² + 6x + 20x - 15
B = - 8x² + 26x - 15