Respostas

2014-03-20T10:10:18-03:00
2014-03-20T10:15:13-03:00
A) (x² + 1) = 7
    x² = 7 - 1
    x² = 6


b) (x - 2 )² - x = 1
    x² - 4 - x = 1
    x² - x = 1 - 4
        x = - 3