Réponses

2013-11-03T19:53:13+01:00
5(x-3)-4x=-8x-9
5x-15-4x=-8x-9
5x-4x+8x=-9+15
9x=6  x=-6/9 ou - 2/3

2(x-1)-3(1-4x)=2-x
2x-2-3+12x=2-x
2x+12x+x=2+2+3
15x=7  x=7/15

(x+7)(-x+2)=0
-x²+2x-7x+14=0
-x²-5x+14=0
2013-11-03T19:55:42+01:00
5(x-3)-4x=-8x-9
5x-15-4x=-8x-9
5x-4x+8x=-9+15
9x=6
x=6/9
x=2/3

2(x-1)-3(1-4x)=2-x
2x-2-3+12x=2-x
2x+12x+x=2+2+3
15x=7
x=7/15

(x+7)(-x+2)=0
x=-7 ou x=2