Question

найдите экстремум f(x)=4/x^2-x

Answer 1

f(x) = 4/x² - x
f'(x) = -8/x³ - 1
-8/x³ - 1 = 0
-8/x³ = 1
x³ = -8
x = -2    <--- точка экстремума