\[\boxed{\mathbf{718\ (718).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[x_{1} = - 0,2\]
\[x_{2} = ?\]
\[4x² - 5,6x + m = 0\ \ \ |\ :4\]
\[x^{2} - 1,4x + \frac{m}{4} = 0\]
\[Ответ:x_{2} = 1,6;\ \ \ \ m = - 1,28.\]