Respostas

2014-09-03T09:27:57-03:00
2x^2+4=0
2x^2=-4
x^2=-4/2
x^2=-2
x= raiz quadrada de -2

x=1,414...
1 1 1
2014-09-03T09:29:05-03:00
2x² - 4 = 0

2x² = 4

x² = 4/2

x² = 2

x = ± raíz de 2

x = 1,41