Respostas

2013-12-03T20:11:32-02:00
X³ - 7x + 10 = 0

Δ = b² - 4ac
(-7)² - 4.1.10
49 - 40
9

x = -b +/- √Δ / 2a
x = 7 +/- √9 / 2
x = 7 +/+ 3 / 2

x' = 7+3/2 
x' = 10/2 = 5

x'' = 7-3/2
x'' = 4/2
x'' = 2