\[(2x + 8)^{2} = 8\]
\[4x^{2} + 16x + 64 - 8 = 0\]
\[4x^{2} + 16x + 56 = 0\ \ \ \ |\ :4\]
\[x^{2} + 4x + 14 = 0\]
\[D_{1} = 4 - 14 < 0\]
\[нет\ корней.\]