Réponse :
Explications étape par étape
Bonjour
A= (x+3)² - (2x-1)(x+3)
1) Calculer A pour x = 2/3
A = (2/3 + 3)^2 - (2 * 2/3 - 1)(2/3 + 3)
A = (2/3 + 9/3)^2 - (4/3 - 3/3)(2/3 + 9/3)
A = (11/3)^2 - (1/3)(11/3)
A = 121/9 - 11/9
A = 110/9
2) Calculer A pour x = √2
A = (√2 + 3)^2 - (2 * √2 - 1)(√2 + 3)
A = 2 + 6 √2 + 9 - (2 √2 - 1)(√2 + 3)
A = 11 + 6 √2 - 2 * 2 - 6 √2 + √2 + 3
A = 11 - 4 + 3 + √2
A = 10 + √2
