Réponse :
a)
Explications étape par étape
Exercice 1 =
a)1) A = 5x - 3
Si x = - 1
A = 5 x (-1) - 3
A = - 5 - 3
A = -8
B = 2x²-5x + 4
Si x = -1
B = 2 x (-1)² - 5 x (-1) + 4
B = 2 x 1 - (-5) + 4
B = 2 + 5 + 4
B = 11
2) Si x = 3
A = 5x3 - 3
A = 15 - 3
A = 12
B = 2x 3² - 5x3 + 4
B = 2x9 - 15 +4
B = 18 - 15 + 4
B = 7
