Ответ:
\[\left( x^{2} - 4 \right)^{2} + \left( x^{2} + 4x \right)^{2} = 0\]
\[x^{2} - 4 = 0\]
\[x^{2} = 4\]
\[x = \pm 2.\]
\[x^{2} + 4x = 0\]
\[x(x + 4) = 0\]
\[x = 0;\ \ x = - 4.\]
\[Ответ:нет\ корней.\]
\[\left( x^{2} - 4 \right)^{2} + \left( x^{2} + 4x \right)^{2} = 0\]
\[x^{2} - 4 = 0\]
\[x^{2} = 4\]
\[x = \pm 2.\]
\[x^{2} + 4x = 0\]
\[x(x + 4) = 0\]
\[x = 0;\ \ x = - 4.\]
\[Ответ:нет\ корней.\]