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2014-02-26T10:42:40-03:00
Resposta

3x² - 7x + 4 = 0

Δ = b² - 4ac
Δ = -7² - 4.3.4
Δ = 49 - 48
Δ = 1

x = -b - + √Δ /2a

x = - (-7) + - √1 /2.3

x = 7 +- 1 /6

x' = 7  + 1 /6

x' = 8/6

x' = 4/3

x'' = 7 - 1 /6

x'' = 6 /6

x'' = 1

Raizes 4/3 e 1
2 5 2