\[\sqrt[6]{x^{2} - 8} = \sqrt[6]{4x - 3}\]
\[x^{2} - 8 = 4x - 3\]
\[x^{2} - 4x - 5 = 0\]
\[x_{1} + x_{2} = 4;\ \ \ x_{1} \cdot x_{2} = - 5\]
\[x_{1} = 5;\ \ \ x_{2} = - 1.\]
\[Проверка.\]
\[x = 5:\]
\[\sqrt[6]{25 - 8} = \sqrt[6]{17}\]
\[\sqrt[6]{17} = \sqrt[6]{17}\]
\[x = 5 - корень\ уравнения.\]
\[x = - 1:\]
\[\sqrt[6]{1 - 8} = \sqrt[6]{- 7}\]
\[\sqrt[6]{- 7} = \sqrt[6]{- 7}\]
\[не\ существует\ такого\ \]
\[значения;\]
\[x = - 1 - не\ является\ корнем\ \]
\[уравнения.\]
\[Ответ:x = 5.\]