\[x² + 4x + 3 = 0\]
\[D = 4² - 4 \cdot 1 \cdot 3 = 16 - 12 = 4\]
\[x_{1} = \frac{- 4 + \sqrt{4}}{2} = \frac{- 4 + 2}{2} = \frac{- 2}{2} =\]
\[= - 1\]
\[x_{2} = \frac{- 4 - \sqrt{4}}{2} = \frac{- 4 - 2}{2} = \frac{- 6}{2} =\]
\[= - 3\]
\[Ответ:\ - 1;\ - 3.\]