Respostas

2014-05-16T13:02:28-03:00
x(x+2)=4x
(x.x)+(x.2) = 4.x
x
² + 2x = 4x
x² +2x - 4x = 0
x² -2x = 0
x.(x-2) = 0
x' = 0
x" = 2
2 4 2