Pouvez vous m’aider svp ? Factoriser: A=3xau carré +6 B-=(2x+7)au carré -(2x+7)(x-4) C=(x-4)au carré -25 D= (3x-5)au carré +(2x+3)(3x-5)

Bonjour,

Factoriser :

A=3x² +6

A = 3 (x² + 2)

B-=(2x+7)² -(2x+7)(x-4)

B = (2x + 7) [( x - 4) - (2x + 7)]

B = (2x + 7) [(2x + 7) - (x - 4)]

B = (2x + 7) (2x + 7 - x + 4)

B = (2x + 7) (x + 11)

C=(x-4)² -25

C = (x - 4 - 5) (x - 4 + 5)

C = (x - 9) (x + 1)

D= (3x-5)² +(2x+3)(3x-5)

D = (3x - 5) (2x + 3 + 3x - 5)

D = (3x - 5) (5x - 2)