Respostas

2014-02-05T22:28:04-02:00
X² - 3x = 10
x² - 3x - 10 = 0

Delta = 9 + 40 = 49

x' = (3 + 7) / 2 = 5
x'' = (3 - 7) / 2 = -2

Prova:

x'² - 3x' = 5² - 3.5 = 25 - 15 = 10
x''² - 3x'' = (-2)² - 3.(-2) = 4 + 6 = 10
1 5 1