Bonjour , Factoriser si possible les expressions suivantes en detaillant les calculs . a) 7x -21 b) 36x²-24x c) 4x (x+3) + (x+3)(3x-11) d) (3x -1)²  - 25 + (3x+

A = 7x - 21

A = 7(x - 3)

B = 36x² - 24x

B = x(36x - 24)

C = 4x(x+3) + (x+3)(3x-11)

C = (x + 3)(4x + 3x - 11)

C = (x + 3)(7x - 11)

D = (3x - 1)² - 25 + (3x+4)(x-9)

D = (3x - 1 - 5)(3x - 1 + 5) + (3x + 4)(x - 9)

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

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

D = (3x + 4)(4x - 15)

E = (9x² + 6x + 1) - 12x - 4

E = 9x² + 6x + 1 - 12x - 4

E = 9x² - 6x - 3

E = 3(3x² - 2x)