Respostas

2014-06-10T18:51:01-03:00
Δ=1²+4(-1).12
Δ=49

x=-1+-7/2
x1=3
x2=-4
2014-06-10T18:56:31-03:00
Aplica a fórmula de Baskara;
Δ=b²-4ac
Δ=1+48
Δ=49
-b+- \sqrt{Δ} / 2a
-1+- \sqrt{49} / 2.1[/tex  ][tex]-1+-7 / 2[tex]  [tex]x2=  \frac{-1-7}{2} =   \frac{-8}{2} = -4 x1= \frac{-1+7}{2} =
  \frac{6}{2} = 3 [/tex][/tex]