Respostas

2013-07-08T17:02:33-03:00
2x²=3x-9+ 2x²-6x
2x²-2x²+3x+9=0
3x+9=0
3x=-9
x=-3
1 3 1
2013-07-08T21:58:25-03:00
2x²=3(x-3)+2x(x-3)
2x²=3x-3.3+2x²-2.3x
2x²-2x²=3x-9-6x
0=-3x-9
x=-9/3
x=-3