Réponses

2014-04-06T16:57:17+02:00
On notera X = x^2
4X = 25
X = 25/4
x = racine(25/4) ou x = - racine(25/4)
soit 5/2 ou -5/2
S = {-5/2,5/2}

3X-1 = 8
3X = 8+1 = 9
X = 9/3 = 3
x = racine(3) ou x = - racine(3)
S={ - racine(3), racine(3)

(x+1)^2 = 121
x+1 = racine (121) ou - racine(121)
x+1 = 11 ou x+1 = -11
x = 10 ou x = -12
S={-12,10}