Réponses

2013-03-02T14:44:02+01:00

a= (x-1)²+x²+(x+1)²

= (x²-2x+1)+x²+(x²+2x+1)

=3x²+2

  • carys
  • Modératrice confirmée
2013-03-02T14:52:04+01:00

A = (x-1)² + x² + (x+1)²

A = x² - 2x + 1 + x² + x² + 2x + 1

A = 3x² + 2