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Meilleure réponse !
  • Utilisateur Brainly
2014-05-12T18:03:29+02:00
A)
   x²-4 = 0
   (x-2)(x+2) = 0
   x-2 = 0
   x = 2

  x+2  =0
  x =-2

b ) x =V3 ou -V3

c) x²-1 = 0
 (x-1)(x+1) = 0
  x-1 =0
x =1
x+1 = 0
x = -1

x²-1/5 = 0
x =-1V5
x =+1V5