Réponse:
Bonjour,
A = (x - 3) (x - 2) + 5 (x - 3)
A = (x² - 2x - 3x + 6) + (5x - 15)
A = (x² - 6x + 6) + (5x - 15)
A = x² - 6x + 6 + 5x - 15
A = x² - 6x + 5x + 6 + (-15)
A = x² - x - 9
B = 3 × (5 - 9x) - (1 - 3x)
B = 15 - 27x - (1 - 3x)
B = 15 - 27x - 1 + 3x
B = -27x + 3x + 15 - 1
B = -24x + 14
Voilà,
Bonne continuation !!!
