\[5x^{2} + 9x - 2 =\]
\[= 5 \cdot (x - 0,2)(x + 2) =\]
\[= (5x - 1)(x + 2).\]
\[D = 81 + 40 = 121\]
\[x_{1} = \frac{- 9 + 11}{10} = \frac{2}{10} = 0,2;\]
\[x_{2} = \frac{- 9 - 11}{10} = - 2.\]