Réponses

  • Utilisateur Brainly
2014-09-03T15:08:32+02:00
(1 - x)(4x + 7) = (x + 3)(1 - x)
(1 - x)(4x + 7) - (x + 3)(1 - x)
- (x - 1)(4x + 7) + (x + 3)(x - 1) = 0
(x - 1)[- (4x + 7) + (x + 3)] = 0
(x - 1)(- 4x - 7 + x + 3) = 0
(x - 1)(- 3x - 4) = 0

x - 1 = 0
x = 1

ou 

- 3x - 4 = 0
- 4 = 3x
- 4/3 = x

S= {- 4/3 ; 1}