Решите уравнение: x^4-16x^2=0.

\[x^{4} - 16x^{2} = 0\]

\[x^{2}\left( x^{2} - 16 \right) = 0\]

\[1)\ x^{2} = 0\]

\[x = 0.\]

\[2)\ x^{2} - 16 = 0\]

\[x^{2} = 16\]

\[x = \pm 4.\]

\[Ответ:x = 0;x = \pm 4.\]