Réponses

2014-02-28T21:09:09+01:00
(3x-6)(8-2x) = 0
Soit,
3x-6 = 0
3x = 6
x = 2
Soit,
8-2x = 0
-2x = -8
x = 4

3x-6(8-2x) = 0
3x-48+12x = 0
15x = 48
x = 48/15

5x/3 7/9
5x = 21/9
5x = 7/3
x = (7/3)*(1/5)
x = 7/15

25-(x+3)² = 0
(5-(x+3)(5+(x+3)) = 0
(5-x-3)(5+x+3) = 0
(-x+2)(x+8) = 0
Soit,
-x+2 = 0
-x = -2
x = 2
Soit,
x+8 = 0
x = -8
merci beaucoup pour ta réponse bonne soirée