Réponses

2014-05-25T19:26:31+02:00
5(x²-8) = x-(3+x)(4-5x)
5x²-40  = x - (12-15x+4x-5x²)
5x²-40 = x-12+11x+5x²
-40 = 12x-12
12x = -40+12
12x = -28
x = -28/12
x = -7/3
  • Utilisateur Brainly
2014-05-25T19:26:44+02:00
5(x²-8)=x-(3+x)(4-5x)
5x²-40 = x-(12-15x+4x-5x²
5x²-40 = x-12+11x+5x²
5x²-12x-5x² = 40-12
-12x = 28
x  =-28/12
   = -7/3