Respostas

2014-05-16T08:45:52-03:00
2x^2 - 90 = 8
2x^2 =8 + 90
2 x^2 = 98
x^2 = 98/2
x^2 = 49
x = √ 49
x = 7
2 3 2
2014-05-16T09:56:22-03:00