Bonjour,

11)

M = (x + 5)²

M = x² + 10x + 25

N = (4 + 7x)²

N = 16 + 56x + 49x²

P = (4x + 6)²

P = 16x² + 48x + 36

S = (x - 5)²

S = x² - 10x + 25

T = (3x - 7)²

T = 9x² - 42x + 49

U = (1 - 6x)²

U = 1 - 12x + 36x²

C = (y + 3) (y - 3)

C = y² - 9

D = (2x + 5) (2x - 5)

D = 4x² - 25

E = (3 + 4x) (4x - 3)

E = 12x - 9 + 16x² - 12x

E = 16x² - 9

F = (7 - 4x) (4x - 7)

F = 28x - 49 - 16x² - 28x

F = - 16x² - 49

12)

a. (3x + 7)² = 9x² + 42x + 49

b. (5x - 6)² = 25x² - 60x + 36

c. (6x + 8) (6x - 8) = 36x² - 64

d. (7x + 5)² = 49x² + 70x + 25

e. (4x - 9)² = 16x² - 72x + 81