$$\left. \begin{array} { l } { 010 } \\ { 2 } \\ { \quad - 3 x ^ { 2 } + 81 = 0 } \\ { 3 x ^ { 2 } + 15 x + 81 \right.$$
$x=-3\sqrt{3}\approx -5.196152423\text{, }y=0\text{, }z=2\text{, }a=162-45\sqrt{3}\approx 84.057713659$
$x=3\sqrt{3}\approx 5.196152423\text{, }y=0\text{, }z=2\text{, }a=45\sqrt{3}+162\approx 239.942286341$
