Bonsoir,

M = (x + 5)²

M = x² + 2 × x × 5 + 5²

M = x² + 10x + 25

N = (4 + 7x)²

N = 4² + 2 × 4 × 7x + (7x)²

N = 16 + 56x + 49x²

P = (4x + 6)²

P = (4x)² + 2 × 4x × 6 + 6²

P = 16x² + 48x + 36

S = (x - 5)²

S = x² - 2 × x × 5 + 5²

S = x² - 10x + 25

T = (3x - 7)²

T = (3x)² - 2 × 3x × 7 + 7²

T = 9x² - 42x + 49

U = (1 - 6x)²

U = 1² - 2 × 1 × 6x + (6x)²

U = 1 - 12x + 36x²

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

C = y² - 3²

C = y² - 9

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

D = (2x)² - 5²

D = 4x² - 25

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

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

E = (4x)² - 3²

E= 16x² - 9

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

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

F = 7² - (4x)²

F = 49 - 16x²