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Mathematics 10 Online
OpenStudy (anonymous):

If f(x)=xe^(9x), find the largest interval on which f(x) is concave upward.

myininaya (myininaya):

did you find f'' and set it =0

OpenStudy (anonymous):

I don't know how to find it...

OpenStudy (turingtest):

\[f'(x)=e^{9x}+9xe^{9x}\]\[f''(x)=9e^{9x}+9e^{9x}+81xe^{9x}=18e^{9x}+81xe^{9x}=0\]

OpenStudy (turingtest):

product rule (f*g)'=f'g+g'f

OpenStudy (anonymous):

-2/9. Thank you!!!

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