Bonsoir,
A = x² - 4x + 7/(x - 2)
a) si x = 3 alors :
A = 3² - 4 × 3 + 7/(3 - 2)
A = 9 - 12 + 7/1 = 9 + 7 - 12
A = 16 - 12 = 4 ✅
b) calculer A pour x = -1
A = (-1)² - 4 × (-1) + 7/(-1 - 2)
A = 1 + 4 + 7/(-3)
A = 5 - 7/3
A = (15 - 7)/3 = 8/3 ✅
Bonne soirée !