Réponses

  • Utilisateur Brainly
2014-10-08T15:30:23+02:00
X² + 4 = 4x
x² - 4x + 4 = 0
x * x - 2 * 2 * x + 2 * 2 = 0
(x - 2)² = 0
x - 2 = 0
x = 2