Question

Como resolver x² + 2x - 35 =0 e (x-2)(x+5)=0

Answer 1

х ^2 + 2x - 35 = 0

Находим дискриминат

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

x1 = $<var>\frac{-b - \sqrt{D}}{2a} = \frac{-2 - \sqrt{144}}{2} = \frac{-14}{2} = -7</var>$

x2 = $<var>\frac{-b - \sqrt{D}}{2a} = \frac{-2 + \sqrt{144}}{2} = \frac{10}{2} = 5</var>$