Répondre :
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)
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)