\left\{ \begin{array} { l } { - \frac { b } { 2 a } = 2 } \\ { \frac { 1 - \Delta } { 4 a } = - 2 } \\ { \frac { 1 + \Delta } { 4 a } = - 5 } \end{array} \right.
Solve for b, a, Δ
b=\frac{2}{7}\approx 0.285714286
a=-\frac{1}{14}\approx -0.071428571
\Delta =\frac{3}{7}\approx 0.428571429
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