Respostas

2013-07-14T18:26:27-03:00
4x^2= 36
x^2 =36: 4
x= +- raiz de 9
x=+- 3
2013-07-14T18:26:38-03:00
 4x² - 36 = 0
4x² = 36
x² = 36/4
x² = 9
x = √9
x' = 3
x" = -3