\[(x + 1)(x - 2) = 0\]
\[x + 1 = 0\ \ \ \ \ \ \ \ \ x - 2 = 0\]
\[x = - 1\ \ \ \ \ \ \ \ \ \ \ \ \ x = 2\]
\[Ответ:\ \ \ x = - 1\ \ \ и\ \ \ x = 2.\]