Question

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

Answer 1

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