Lös ut x
\left\{\begin{matrix}x\neq 15\text{, }&k=4\\x\neq 7\text{, }&k=2\\x\in \mathrm{R}\text{, }&k>2\text{ and }k<4\\x\in \left(\sqrt{\left(k-4\right)\left(k-2\right)}+4k-1,\infty\right)\cup \left(-\infty,-\sqrt{\left(k-4\right)\left(k-2\right)}+4k-1\right)\text{, }&k<2\text{ or }k>4\end{matrix}\right,
Lös ut k
\left\{\begin{matrix}k\neq -\frac{4\sqrt{15}}{15}+3\text{, }&x=11-\sqrt{15}\\k\neq \frac{4\sqrt{15}}{15}+3\text{, }&x=\sqrt{15}+11\\k\in \mathrm{R}\text{, }&x>11-\sqrt{15}\text{ and }x<\sqrt{15}+11\\k\in \left(\frac{\sqrt{x^{2}-22x+106}+4x+1}{15},\infty\right)\cup \left(-\infty,\frac{-\sqrt{x^{2}-22x+106}+4x+1}{15}\right)\text{, }&x<11-\sqrt{15}\text{ or }x>\sqrt{15}+11\end{matrix}\right,
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