\[x^{2} + 3,5x - 2 \leq 0\]
\[x^{2} + 3,5x - 2 = 0\]
\[D = 12,25 + 8 = 20,25\]
\[x_{1} = \frac{- 3,5 + 4,5}{2} = 0,5\]
\[x_{2} = \frac{- 3,5 - 4,5}{2} = - 4\]
\[Ответ:\ x = - 4;\ - 3;\ - 2;\ - 1;0.\]