Réponses

  • Utilisateur Brainly
2014-09-29T18:59:15+02:00
X² + 10x = 39
x² + 10x - 39 = 0
x * x + 10x - 13 * 3 = 0
(x - 3)(x + 13) = 0

x - 3 = 0
x = 3

x + 13 = 0
x = - 13

x² + 12x = 64
x² + 12x - 64 = 0
x * x + 3x * 4 - 4 * 16 = 0
(x - 4)(x + 16)  = 0

x - 4 = 0
x = 4

x + 16 = 0
x = - 16