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