Solve for E
E=|c|\sqrt{p^{2}+\left(cm\right)^{2}}
Solve for c
\left\{\begin{matrix}c=0\text{, }&E=0\text{ and }m\neq 0\text{ and }p=0\\c=-\frac{\sqrt{2\left(\sqrt{p^{4}+4\left(Em\right)^{2}}-p^{2}\right)}}{2|m|}\text{; }c=\frac{\sqrt{2\left(\sqrt{p^{4}+4\left(Em\right)^{2}}-p^{2}\right)}}{2|m|}\text{, }&m\neq 0\text{ and }E\geq 0\\c=-\frac{E}{p}\text{; }c=\frac{E}{p}\text{, }&p\neq 0\text{ and }m=0\text{ and }E\geq 0\\c\in \mathrm{R}\text{, }&p=0\text{ and }E=0\text{ and }m=0\end{matrix}\right.
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