\left\{ \begin{array} { l } { \frac { - b } { 2 a } = 4 } \\ { \frac { 4 a \cdot b ^ { 2 } } { 4 a } = 3 } \end{array} \right.
Solve for b, a
b=\sqrt{3}\approx 1.732050808\text{, }a=-\frac{\sqrt{3}}{8}\approx -0.216506351
b=-\sqrt{3}\approx -1.732050808\text{, }a=\frac{\sqrt{3}}{8}\approx 0.216506351
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