State the intervals of increase and decrease

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angela107
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Homework Statement
What are the intervals of increase and decrease of ##y=3x^5-5x^3##?
Relevant Equations
n/a
Screen Shot 2020-05-28 at 2.51.26 PM.png

Is my answer correct?
 
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on Phys.org
BvU said:
What is the meaning of your picture ? It is utterly useless and confusing to me !

I agree with your answer, but what about x=0 ?
sorry, that graph wasn't supposed to be there!
x=0 is an inflection point
 
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