Найди корни уравнения (4,9+3,5x)(7x-2,8)=0.

\[(4,9 + 3,5x)(7x - 2,8) = 0\]

\[1)\ 4,9 + 3,5x = 0\]

\[3,5x = - 4,9\]

\[x = - 4,9\ :3,5\]

\[x = - 1,4\]

\[2)\ 7x - 2,8 = 0\]

\[7x = 2,8\]

\[x = 2,8\ :7\]

\[x = 0,4\]

\[Ответ:x = - 1,4;\ \ 0,4.\]