Respostas

2013-10-24T16:45:09-02:00
(x-5)² = x² - 10x + 25
x² - 10x + 25 = 25 - 9x
x² - 10x + 25 - 25 + 9x = 0
x² - x = 0
x² = x
x = 1
3 4 3