Réponse :
Explications étape par étape
Bonsoir
Résoudre :
50 = 2x^2 - 14x + 62
2x^2 - 14x + 62 - 50 = 0
2x^2 - 14x + 12 = 0
2(x^2 - 7x + 6) = 0
x^2 - 7x + 6 = 0
x^2 - 2 * x * 7/2 + (7/2)^2 - (7/2)^2 + 6 = 0
(x - 7/2)^2 - 49/4 + 24/4 = 0
(x - 7/2)^2 - 25/4 = 0
(x - 7/2)^2 - (5/2)^2 = 0
(x - 7/2 - 5/2)(x - 7/2 + 5/2) = 0
(x - 12/2)(x - 2/2) = 0
(x - 6)(x - 1) = 0
x - 6 = 0 ou x - 1 = 0
x = 6 ou x = 1
