Respostas

2013-07-02T12:51:40-03:00

х ^2 + 2x - 35 = 0

Находим дискриминат

D = b^2 - 4ac = 4  - 4 * 1 * (-35) = 4 + 140 = 144

x1 = \frac{-b - \sqrt{D}}{2a} = \frac{-2 - \sqrt{144}}{2} = \frac{-14}{2} = -7

x2 = \frac{-b - \sqrt{D}}{2a} = \frac{-2 + \sqrt{144}}{2} = \frac{10}{2} = 5

2 4 2