\left\{ \begin{array} { l } { \frac { - b } { 2 a } = 2 } \\ { \frac { 1 - \Delta } { a a } = - 2 } \\ { \frac { 1 + a } { a a } = - \frac { 5 } { 2 } } \end{array} \right.
Solve for b, a, Δ
b=\frac{4}{5}+\frac{12}{5}i=0.8+2.4i\text{, }a=-\frac{1}{5}-\frac{3}{5}i=-0.2-0.6i\text{, }\Delta =\frac{9}{25}+\frac{12}{25}i=0.36+0.48i
b=\frac{4}{5}-\frac{12}{5}i=0.8-2.4i\text{, }a=-\frac{1}{5}+\frac{3}{5}i=-0.2+0.6i\text{, }\Delta =\frac{9}{25}-\frac{12}{25}i=0.36-0.48i
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