Предмет: Математика, автор: katerinaliroy

Найдите промежутки функции
у=-х^3+9х^2+21х

Ответы

Автор ответа: PutereDinu

1

$- x^{3} +9 x^{2} +21x= \\ = x (8x+9x +21)= \\ =x(17x+21)= \\ =17 x^{2} +21x= \\ \boxed{=38x^{2}}.$

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