Respostas

2014-07-23T19:03:01-03:00
Olá, Jessicalealcarv!

-2x² + 6x = 0 (-1)
2x² - 6x = 0
x (2x - 6)

x' = 0

2x - 6 = 0
2x = 6
x = 6/2
x = 3

Então:
x' = 0
x'' = 3