\[x² + 6x + 4 = 0\ \]
\[D = 36 - 16 = 20\]
\[x_{1,2} = \frac{- 6 \pm \sqrt{20}}{2} = \frac{- 6 \pm 2\sqrt{5}}{2} =\]
\[= - 3 \pm \sqrt{5}.\]
\[Ответы:\ - 3 \pm \sqrt{5.}\text{\ \ }\]