$$\left. \begin{array} { l } { x ^ { 3 } - 3 x - 10 = 0 } \\ { \sqrt { 2 x ^ { 2 } + 7 x + \right.$$
$x=\sqrt[3]{2\sqrt{6}+5}+\sqrt[3]{5-2\sqrt{6}}\approx 2.612887865$
