Question

Помогите пожалуйста

Answer 1

${x}^{2} - x - 2 = 0 \ d = {b}^{2} - 4ac \ d = { (- 1)}^{2} - 4 times 1 times ( - 2) = 1 + 8 = 9 \ x = frac{1 + 3}{2 } = 2 \ x = frac{1 - 3}{2} = - 1$
$2 {x}^{2} + x = 0 \ d = {1}^{2} - 4 times 2 times 0 = 1 \ x = frac{ - 1 + 1}{4} = 0 \ x = frac{ - 1 - 1}{4} = - frac{1}{2}$