What is the extreme f(x)=x^{1/3 (4x^2-14x-224)} ?

The extreme f(x)=x^{1/3 (4x^2-14x-224)} is None

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extreme f(x)=x^{1/3 (4x^2-14x-224)}

extreme points

f (x) = x^{\frac{1}{3} (4 x^{2} - 14 x - 224)}

None

Solution steps

f^{'} (x) = \frac{1}{3} x^{\frac{1}{3} (4 x^{2} - 14 x - 224)} (ln (x) (8 x - 14) + \frac{4 x ^{2} - 14 x - 224}{x})

Find intervals:

None

None

What is the extreme f(x)=x^{1/3 (4x^2-14x-224)} ?
The extreme f(x)=x^{1/3 (4x^2-14x-224)} is None