Δ = [tex]b^{2} - 4ac[/tex]
a=1 b=2 c= -2
Δ = 4 + 8
Δ =12
[tex]x_{1} = \frac{-b-\sqrt{Delta}}{2a}[/tex]
[tex]x_{1} = \frac{-2-\sqrt{12}}{2}[/tex]
[tex]x_{1} = - \sqrt{3} -1[/tex]
[tex]x_{2} = \frac{-b+\sqrt{Delta}}{2a}[/tex]
[tex]x_{2} = \frac{-2+\sqrt{12}}{2}[/tex]
[tex]x_{2} = \sqrt{3} -1[/tex]
