\left\{ \begin{array} { l } { b + a = 5 } \\ { a b = 7 } \end{array} \right.
I-solve ang b, a
b=\frac{5+\sqrt{3}i}{2}\approx 2.5+0.866025404i\text{, }a=\frac{-\sqrt{3}i+5}{2}\approx 2.5-0.866025404i
b=\frac{-\sqrt{3}i+5}{2}\approx 2.5-0.866025404i\text{, }a=\frac{5+\sqrt{3}i}{2}\approx 2.5+0.866025404i
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