factoriser chaque expressions svp : (les x c l'ecriture pas la multiplication) A= x(x+5) + x(3x-2) B= (x+5)(2x+1)+6(2x+1) C= -4x(2x+3)+(2x+3)(9x-2) D= -8x(5x-1)

bonsoir,

A= x(x+5) + x(3x-2)
   = x(x+5+3x-2)
  = x(4x+3)

B= (x+5)(2x+1)+6(2x+1)
  = (2x+1)(x+5+6)
  = (2x+1)(x+11)

C= -4x(2x+3)+(2x+3)(9x-2)
  = (2x+3)(4x+9x-2)
  = (2x+3)(13x-2)

D= -8x(5x-1)-8x(12-x)
   = 8x(5x-1-12+x)
   = 8x(6x-13)