Respostas

2014-02-09T16:03:29-02:00
3x - 2 + 7x(3x - 2) = 0
3x - 2 + 21x - 14 = 0
-16 + 18x = 0
18x = 16
X = 18/16
X = 1,125
2014-02-09T16:13:52-02:00
9x-6x+21x-6x+4-14x=0
9x-6x+21x-6x-14x=-4
3x+21x-6x-14x=-4
24x-6x-14x=-4
18x-14x=-4
4x=-4
x=-4/4
x=-1