Ответ:

-3,5;4

Объяснение:

[tex](2x - 5)(x + 2) = 18 \\ 2 {x}^{2} + 4x - 5x - 10 = 18 \\ 2 {x}^{2} - x - 18 - 10 = 0 \\ 2 {x}^{2} - x - 28 = 0 \\ d = 1 + 224 = 225 = {15}^{2} \\ x = \frac{1 + 15}{4} = \frac{16}{4} = 4 \\ x = \frac{1 - 15}{4} = - \frac{14}{4} = - \frac{7}{2} = - 3.5[/tex]