Réponses

  • Utilisateur Brainly
2014-03-27T19:28:03+01:00
A  2x²+(x-4)(3-x)
=2x²-x²+3x+4x-12
=x²+7x-12

B  x(x-1)-3(x+1
=x²-x-3x-3
=x²-4x-3

C  (x+2)(-x-3)+3x²

=3x²-x²-2x-3x-6
=2x²-5x-6