Réponse :
1 :
A = (2x -3) (3x - 1) + (2x - 3)²
= 6x² - 2x - 9x + 3 + (2x - 3)²
= 6x² - 2x - 9x + 3 + 4x² - 12x + 9
= 10x² -2x -9x + 3 - 12x +9
= 10x² - 23x + 3 + 9
= 10x² - 23x + 12
2 :
A = (2x - 3) (3x - 1 + 2x -3)
= (2x - 3) (5x- 1 - 3)
= (2x - 3) (5x - 4)
