Respostas

2013-07-18T22:07:13-03:00
A) 4x² = 9
x² = 9/4
x = V9/4
x = 3/4
b) x² = 4
x = V4
x = + ou - 2
c) 9x² = 16
x² = 16/9
x = V16/9
x = 4/3
d) 4x² = 100
x² = 100/4
x² = 25
x = V25
x = + ou- 5