Respostas

2014-09-02T17:44:39-03:00
(2x - 6)² = 48
4x² -12x -12x +36 =48
4x² -24x -12=0    /4
x² - 6x - 3=0
Δ=48
x= (6 +-√Δ)/2
x'=3√48
x'= 7√3

x"= - √3