Question

Сумма координат вершины параболы y=-1/2x^2-3x-8,5 равна?

Answer 1

$y = - \frac{1}{2} {x}^{2} - 3x - 8.5 \\ x_{0} = - \frac{b}{a} = - 3 \div ( - \frac{1}{2} ) = - ( - 3) \times ( - 2) = - ( - 6) = 6 \\ y _{0} = - \frac{1}{2} \times {6}^{2} - 3 \times 6 - 8.5 = - \frac{1}{2} \times 36 - 18 - 8.5 = - 18 - 18 - 8.5 = - 44.5 \\ x _{0} + y_{0} = 6 + (- 44.5) = - 38.5$