Ответ:
- \[ 2x^2 + (25-7)x + (31-9) = 0 \]
- \[ 2x^2 + 18x + 22 = 0 \]
- \[ x^2 + 9x + 11 = 0 \]
- \[ D = b^2 - 4ac = 9^2 - 4 \cdot 1 \cdot 11 = 81 - 44 = 37 \]
- \[ x_{1,2} = \frac{-b \pm \sqrt{D}}{2a} = \frac{-9 \pm \sqrt{37}}{2} \]
Ответ: (-9-√37)/2, (-9+√37)/2
