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Hi,<br />
<br />
I am not sure how to find the turning point to this graph. I have seen an answer to this and the turning point is at x=15. <br />
How do I get the turning points for such a graph?<br />
<br />
^ is power to<br />
<br />
f(x)=x^3 (/160) * (20-x)
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Hi,

I am not sure how to find the turning point to this graph. I have seen an answer to this and the turning point is at x=15. 
How do I get the turning points for such a graph?

^ is power to

f(x)=x^3 (/160) * (20-x)

turning point

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