Réponses

2013-04-10T18:50:16+02:00

reponses

1.facto

(4x-7)(2-3x+4x+5)=0

(4x-7)(7+x)=0

2.

4x-7=o        7+x=o

x=7/4          x=-

2013-04-10T19:00:44+02:00
1. (4x-7)[(2-3x) + (4x+5)] = 0
(4x-7)(2 -3x +4x +5) = 0
(4x-7)(7+x) = 0

2. (4x-7)(7+x) = 0
4x-7 = 0 ou 7+x = 0
4x = 7 ou x = -7
x = 7/4 ou x = -7