Réponses

2014-03-14T13:15:10+01:00
Bonjour,

A = (x + 4)²  + (5x + 2)(x - 4)
  
A = (x² + 8x + 16) + (5x² - 20x + 2x - 8)

A = x² + 8x + 16 + 5x² - 20x + 2x - 8

A = 6x² - 10x + 8