Respostas

2013-05-13T18:12:48-03:00

9x * 9x = 16, logo 9x =4

x = 4/9

2013-05-13T18:18:09-03:00

9x² = 16

x = √(16/9)

 

-4x² = -100

x² = √100/4

x² = 25

x = 5

 

2x² + 13 = 0

±√(-4.2.13)/4

±√-104/4

 

64 = x²

x = √64

x = 8