\[y² - 11y + 2,4 = 0\]
\[D = b^{2} - 4ac =\]
\[= 121 - 4 \cdot 1 \cdot 2,4 =\]
\[= 121 - 9,6 = 111,4\]
\[y_{1} = \frac{11 + \sqrt{111,4}}{2}\]
\[y_{2} = \frac{11 - \sqrt{111,4}}{2}\]
\[Ответ:при\ y = \frac{11 + \sqrt{111,4}}{2}\ \ и\ \ \ \]
\[y = \frac{11 - \sqrt{111,4}}{2}.\]