Sagot :

Bonjour,

a)

A = - 11x (- 8x + 7)

A = 88x² - 77x

B = (- 6x + 9) (4 - 3x)

B = - 24x + 18x² + 36 - 27x

B = 18x² - 51x + 36

C = (6x + 5)²

C = 36x² + 60x + 25

D = (3x - 1)²

D = 9x² - 6x + 1

E = (7b - 2) (7b + 2)

E = 49b - 4

b)

(5x - 7)² = (5x + 4)²

25x² - 70x + 49 ≠ 25x² + 40x + 16