Question

5х(в квадрате) + 8х все деленное на 2=2

Answer 1

(5x² + 8x) / 2 = 2
5x² + 8x = 2 × 2
5x² + 8x = 4
5x² + 8x - 4 = 0
D = b² - 4ac = 8² - 4 × 5 × ( - 4) = 64 + 80 = 144 = 12²
x₁ = - 8 + 12 / 10 = 4 / 10 = 0,4
x₂ = - 8 - 12 / 10 = - 20 / 10 =- 2