Question

решите уравнение 2х^2+9х-11=0

Answer 1

${2x}^{2} + 9x - 11 = 0 \\ \: \: D= {9}^{2} - 4 \times 2 \times ( - 11) = 81 + 88 = \sqrt{169} = 13 \\ x = \frac{ - 9 - 13}{2 \times 2} = \frac{ - 22}{4} = - 5.5 \\ x = \frac{ - 9 + 13}{2 \times 2} = \frac{4}{4} = 1$
Ответ: -5,5; 1