Réponse :
Bonsoir
Explications étape par étape
U(2) = -3
U(3) = U(2)² - 6 = (-3)² - 6 = 9 - 6 = 3
U(4) = U(3)² - 6 = 3² -6 = 9 - 6 = 3
U(5) = U(4)² - 6 = 3² -6 = 9 - 6 =3
U(6) = U(5)² -6 = 3² - 6 = 9 - 6 = 3
