Réponses

2014-02-22T08:45:49+01:00
Bonjour

A) (x + 5 )² = 0
 x + 5 = 0
 x = -5

B) (x - 7)² = 0
x - 7 = 0
x = 7

C) (x - 1/2)² = 0
x - 1/2
 = 0
x = 1/2
x = 0,5

D) (2/5x - 3)² = 0
2/5 x - 3 = 0
2/5 x = 3
x = 3 * (5/2)
x = 15/2
x = 7,5