Respostas

2014-09-04T09:26:42-03:00
X(x + 3) = 5x
x² + 3x = 5x ⇒ x² + 3x - 5x = 0
x² - 2x = 0
x(x - 2) = 0
x' = 0
x - 2 = 0
x" = 2