Найдите координаты вершины параболы: |18. g(x) = x² + 6x. 20.g(x) = 3 - x-x². 17. g(x) = x² - 4x + 1. 19. g(x) = 10 - 2x + 5x². ​

Ответ:1) g(x) = x^2 - 4x + 1

Xв = -b/2a = - -4/2*1 = 2

Yв = 2^2 - 4*2 + 1 = -3

(2; -3)

2) g(x) = x^2 + 6x

Хв = -b/2a = - 6/2*1 = -3

Yв = (-3)^2 + 6*(-3) = -9

(-3; -9)

3) g(x) = 10 - 2x + 5x^2

Xв = -b/2a = - -2/2*5 = 1/5

Yв = 10 - 2*1/5 + 5*(1/5)^2 = 8 4/5

(1/5; 8 4/5)

4) g(x) = 3 - x - x^2

Xв = -b/2a = - -1/2*(-1) = -1/2

Yв = 3 - (-1/2) - (-1/2)^2 = 3 + 1/2 - 1/4 = 3 1/4

(-1/2; 3 1/4)

Объяснение: