Réponses

  • Utilisateur Brainly
2013-09-22T18:39:11+02:00
A(x)=25x²-(1-2x)²
      =(5x+1-2x)(5x-1+2x)
       =(3x+1)(7x-1)

B(x)=4x(1-7x)-(1-7x)(3x+1)

      =(1-7x)(4x-3x-1)
      =(1-7x)(x-1)