Question

Найдите минимум функции y=7x^4/4+14x^3/3+7x^2/2+2.

Answer 1

y'=7x^3+14x^2+7x=0

x=0

x^2+2x+1=(x+1)^2=0

x=-1

y''=21x^2+28x+7

y''(0)>0 минимум

y(0)=2