Réponse:
Emma n'a pas raison car si x = 1 :
A = 4(x + 5) - 8
A = 4(1 + 5) - 8
A = 4 × 6 - 8
A = 24 - 8
A = 16
B = x² + 15
B = 1² + 15
B = 1 + 15
B = 16
A = B = 16
Si x = 3 :
A = 4(x + 5) - 8
A = 4(3 + 5) - 8
A = 4 × 8 - 8
A = 32 - 8
A = 24
B = x² + 15
B = 3² + 15
B = 9 + 15
B = 24
A = B = 24
MAIS si x = 2
A = 4(x + 5) - 8
A = 4(2 + 5) - 8
A = 4 × 7 - 8
A = 28 - 8
A = 20
B = x² + 15
B = 2² + 15
B = 4 + 15
B = 19
A n'est pas égal à B.
N'hésites pas si tu as des questions.
