$$\left. \begin{array} { l } { \frac { 1 } { \sqrt { 3 } } } \\ { \sqrt { 5 } ( x - y ) = ( - x ^ { 2 } ) ( - 1 ) ^ { 2 } = } \\ { x ^ { 2 } - ( x ^ { 2 } + x ) - y ^ { 2 } = - ( - x ) ^ { 2 } + ( x + y ) ^ { 2 } = 1 - \right.$$
$x=0\text{, }y=0\text{, }z=\frac{\sqrt{3}}{3}\approx 0.577350269$
$x=\frac{\sqrt{15}\left(\sqrt{3}\sin(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\right)-3\sqrt{5}}{3}\approx -0.312431232\text{, }y=\frac{\sqrt{5}\left(\sqrt{15}\left(\sqrt{3}\sin(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\right)-3\sqrt{5}\right)^{2}+15\sqrt{15}\left(\sqrt{3}\sin(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\right)-45\sqrt{5}}{45}\approx -0.268777248\text{, }z=\frac{\sqrt{3}}{3}\approx 0.577350269$
$x=\frac{-2\sqrt{15}\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})-3\sqrt{5}}{3}\approx -4.689434624\text{, }y=\frac{2\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\left(2\sqrt{5}\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\sqrt{15}\right)}{3}\approx 5.145148812\text{, }z=\frac{\sqrt{3}}{3}\approx 0.577350269$
$x=\frac{\sqrt{15}\left(-\sqrt{3}\sin(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\right)-3\sqrt{5}}{3}\approx -1.706338077\text{, }y=\frac{\sqrt{5}\left(\sqrt{15}\left(-\sqrt{3}\sin(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\right)-3\sqrt{5}\right)^{2}+15\sqrt{15}\left(-\sqrt{3}\sin(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})+\cos(\frac{\arccos(\frac{3\sqrt{15}}{20})}{3})\right)-45\sqrt{5}}{45}\approx -0.404235609\text{, }z=\frac{\sqrt{3}}{3}\approx 0.577350269$