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OpenStudy (anonymous):
On what intervals is the function f(x)=x^(5)-5x^(4) both decreasing and concave up?
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OpenStudy (anonymous):
First derivative 5x^4-20x^3. Whenever this is below 0, it is decreasing. Second derivative 20x^3-60x^2. Whenever this is above 0, it is concave up.
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