Bonjour, A = 4 (2x + 2) + 3 (2x + 6) B = (5x - 4) - (- 9x - 30) Démontrer que A = B Merci pour votre aide

A = 4 (2x + 2) + 3 (2x + 6)
A = 4 * 2x + 4 * 2 + 3 * 2x + 3 * 6
A = 8x + 8 + 6x + 18
A = 14x + 26

B = (5x - 4) - (- 9x - 30)
B = 5x - 4 + 9x + 30
B = 14x + 26

On a bien démontré que A = B.

Bonjour,

A = 4 (2x + 2) + 3 (2x + 6)
A = 8x + 8 + 6x + 18
A = 8x + 6x + 8 + 18
A = 14x + 26

B = (5x - 4) - (- 9x - 30)
B = 5x - 4 + 9x + 30
B = 5x + 9x - 4 + 30
B = 14x + 26

Démontrer que A = B
A = B
car
14x + 26 = 14x + 26