Bonsoir,
➡️ Pour x = 2
A = 3x + 8x + 5 = 11x + 5
= 11 × 2 + 5 = 22 + 5 = 27 ✅
B = x + 4x² + 6 = 2 + 4 × 2² + 6
= 2 + 4 × 4 + 6 = 2 + 16 + 6 = 24 ✅
C = 3x + 5x + 4x - 3x² = 12x - 3x²
= 12 × 2 - 3 × 2² = 24 - 3 × 4 = 24 - 12 = 12 ✅
D = x + x + 4 + 2x = 4x + 4 = 4 × 2 + 4
= 8 + 4 = 12 ✅
Bonne soirée !
