Réponses

2014-02-02T00:09:44+01:00
Bonsoir

J = (x² + 2x + 1) - (2x + 3)²
  = (x + 1)² - (2x + 3)²
  = [(x + 1) + (2x + 3)][(x + 1) - (2x + 3)]
  = (x + 1 + 2x + 3)(x + 1 - 2x - 3)
  = (3x + 4)(-x - 2)