Respostas

2014-08-28T15:04:41-03:00
X ( X + 1) = 10X
X² + X - 10X = 0
X²  - 9X = 0
X(X -9) = 0 ( Coloquei x em evidência)
X = 0
X -9 = 0
X = 9
V = { 0, 9}
2014-08-28T15:07:50-03:00
X2 + x - 10x = 0
x(x +1 - 10) = 0
x (x -9) =0
********************************** x -9 = 0
x = 9
ou
x = 0

R: S = {0; 9}