Réponses

  • Utilisateur Brainly
2014-05-31T08:19:19+02:00
X² - 5 = 20
x² = 20 + 5
x² = 25
x = √25 ou x = - √25
x = 5 ou x = - 5

x² + 110 = 10
x² = 10 - 110
x² = - 100
x = 10i ou x = - 10i