Solve for k, b, a (complex solution)
k\in \mathrm{C}\text{, }b=\frac{4}{a}\text{, }a=\sqrt{k^{2}-4}+k
k\in \mathrm{C}\text{, }b=\frac{4}{a}\text{, }a=-\sqrt{k^{2}-4}+k
Solve for k, b, a
k\in (-\infty,-2]\cup [2,\infty)\text{, }b=\frac{4}{a}\text{, }a=-\sqrt{k^{2}-4}+k\text{; }k\in (-\infty,-2]\cup [2,\infty)\text{, }b=\frac{4}{a}\text{, }a=\sqrt{k^{2}-4}+k
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