\[f(x) = \sqrt[3]{x}\]
\[f\left( x^{2} \right) - 3f(x) - 10 = 0\]
\[\sqrt[3]{x^{2}} - 3\sqrt[3]{x} - 10 = 0;\ \ \ \ \ \ t = \sqrt[3]{x}\]
\[t^{2} - 3t - 10 = 0\]
\[D = 9 + 40 = 49\]
\[t_{1} = \frac{3 + 7}{2} = 5;\text{\ \ \ \ \ \ \ \ \ }\]
\[t_{2} = \frac{3 - 7}{2} = - 2\]
\[\left( \sqrt[3]{x} \right)^{3} = (5)^{3}\text{\ \ \ \ \ \ \ \ \ \ \ \ \ }\]
\[\left( \sqrt[3]{x} \right)^{3} = ( - 2)^{3}\]
\[x = 125\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - 8\]
\[Ответ:\ 125\ \ и\ \ ( - 8).\]