Réponses

2013-10-19T11:33:01+02:00
Question n°1 :

A = (2x - 4)(5 - x) + (2x - 4)²
A = 10x - 2x² - 20 + 4x + 4x² - 16x + 16
A = 2x² * 2x - 4.

Question n°2 :

A = (2x - 4)(5 - x) + (2x - 4)²
A = (2x - 4) [(5 - x) + (2x - 4)]
A = (2x - 4) (5 - x + 2x - 4)
A = (2x - 4) (x + 1)