Réponses

2013-03-08T21:48:02+01:00

A= (2x+1)(3-x)-(9-3x)(x-2)

  = (3-x)(2x+1-3(x-2)

  = - (3-x)(x+1) 

 

B = (4x-3)(2x+1)+(16x²-9)

    = (4x - 3)(2x+1 + 4x+3)

    = (4x - 3)(6x + 4)

    = 2(4x-3)(3x+2)

 

C= 18x-8x^3

   = 2x(9 - 4x²)