\left\{ \begin{array} { l } { x _ { 1 } + x _ { 2 } = 12 } \\ { x _ { 1 } x _ { 2 } = 4 } \end{array} \right.
Solve for x_1, x_2
x_{1}=4\sqrt{2}+6\approx 11.656854249\text{, }x_{2}=6-4\sqrt{2}\approx 0.343145751
x_{1}=6-4\sqrt{2}\approx 0.343145751\text{, }x_{2}=4\sqrt{2}+6\approx 11.656854249
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