Respostas

2014-05-24T00:21:16-03:00
(x-3)²=16
x²+9=16
x²=16-9
x²=7
x=+-Raizde7

(2x-3)² = 25
4x²+9=25
4x²=25-9
4x²=16
x²=16/4
x²=4
x=Raizde4
x=+-2