\[x^{2} - 5|x| + 6 = 0\]
\[x > 0:\]
\[x^{2} - 5x + 6 = 0\]
\[x_{1} + x_{2} = 5;\ \ \ x_{1} \cdot x_{2} = 6\]
\[x_{1} = 3;\ \ \ x_{2} = 2.\]
\[x < 0:\]
\[x^{2} + 5x + 6 = 0\]
\[x_{1} + x_{2} = - 5;\ \ \ x_{1} \cdot x_{2} = 6\]
\[x_{1} = - 3;\ \ \ x_{2} = - 2.\]
\[Ответ:x = \pm 2;\ \ x = \pm 3.\]