Pouvez-vous m’aider A Factoriser A=4(x-2)-(x-2)(3x+1) B=5-9x+(5-9x)(1-3x) C=(3x-7)au carre -(1-2x)(3x-7) Merci d’avance

Factoriser

A = 4(x-2) - (x-2)(3x+1)

A = (x - 2) [ 4 - (3x - 1)]

A = ( x - 2) [ 4 - 3x + 1]

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

B = 5 - 9x + (5-9x)(1-3x)

B = ( 5 - 9x) ×1 + ( 5- 9x) ( 1 - 3x )

B = ( 5 - 9x ) [ 1 + 1 - 3x ]

B = ( 5 - 9x ) ( - 3x + 2 )

C = (3x-7)² - (1-2x)(3x-7)

C = ( 3x - 7)(3x - 7) - [ ( 3x - 7) - ( 1 - 2x) ]

C = ( 3x - 7 )  [ 3x - 7 - 1 + 2x ]

C = ( 3x - 7) ( 5x - 8 )