Lös ut a (complex solution)
\left\{\begin{matrix}\\a=\sqrt{x^{2}+18x+9}+x+3\text{, }&\text{unconditionally}\\a=-\sqrt{x^{2}+18x+9}+x+3\text{, }&x\neq 0\end{matrix}\right,
Lös ut a
\left\{\begin{matrix}a=-\sqrt{x^{2}+18x+9}+x+3\text{, }&\left(x\neq 0\text{ and }x\geq 6\sqrt{2}-9\right)\text{ or }x\leq -6\sqrt{2}-9\\a=\sqrt{x^{2}+18x+9}+x+3\text{, }&x\geq 6\sqrt{2}-9\text{ or }x\leq -6\sqrt{2}-9\end{matrix}\right,
Lös ut x
x=\frac{a\left(a-6\right)}{2\left(a+6\right)}
a\neq 0\text{ and }a\neq -6
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