Respostas

2014-07-17T07:36:41-03:00
7x - x² - 6 = 0 .(- 1)
- 7x + x² + 6 = 0
x² - 7x + 6 = 0
Δ = (- 7)² - 4.1.6
Δ = 49 - 24
Δ = 25

x = 7 + - √ 25 / 2
x = 7 + - 5 / 2

x ' = 7 + 5 / 2 = 12 / 2 = 6

x '' = 7 - 5 / 2 = 2 / 2 = 1
 
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