\[x^{5} + x^{4} + 3x^{3} + 3x^{2} + 4x + 4 =\]
\[= 0\]
\[(x + 1)\left( x^{4} + 3x^{2} + 4 \right) = 0\]
\[x + 1 = 0\]
\[x = - 1.\]
\[x^{4} + 3x^{2} + 4 = 0\]
\[Пусть\ x^{2} = a:\]
\[a^{2} + 3a + 4 = 0\]
\[D = 9 - 16 = - 7 < 0\]
\[нет\ корней.\]
\[Ответ:x = - 1.\]