Respostas

2014-08-22T00:43:41-03:00
Anula x com -x e 2 com -2 e da -1 o redultado
A melhor resposta!
2014-08-22T00:47:53-03:00
2x - x² - x - 4 + 2x + 2 = 0
- x² + 3x - 2 = 0
Δ= 3² - 4.(-1).(-2) = 9 - 8 = 1
x =  \frac{-3 +/- \sqrt{1} }{2.(-1)}  =  \frac{-3 +/-1}{-2}
x' =  \frac{-3+1}{-2} =  \frac{-2}{-2}  = 1
x'' =  \frac{-3-1}{-2} =  \frac{-4}{-2} = 2
S = {1;2}
1 5 1