Respostas

2013-09-26T14:22:52-03:00
X²/2 - x = -4/9
9x² - 18x = -8
9x² - 18x + 8 = 0 
a = 9
b = - 18
c = 8

Δ = b² - 4 a c
Δ = (-18)² - 4 . 9 . 8
Δ = 324 - 288
Δ = 36

x = -b ± √Δ/ 2 a
x = -(-18) ± √36/ 2 . 9
x = 18 ± 6 / 18

x' = 18 + 6 / 18 = 24/ 18 simplifica por 6 = 4/3
x'' = 18 - 6/ 18 = 12/18 simplifica por 6 = 2/3
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