`F(x) = x^(4/5)(x - 4)^2` Find the critical numbers of the function

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Given: `F(x)=x^(4/5)(x-4)^2`

Find the critical number(s) by setting the first derivative equal to zero and solve for the x value(s).











The critical values are `x=4`   and `x=8/7.`

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