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April 1, 2015

Homework Help: Math-Calculus (check please)

Posted by songyi on Saturday, November 1, 2008 at 8:32pm.

FOr the function f(x)=x^2e^x

Find the critical points, increasing decreasing, first and second derivative and concavity

I am having trouble finding the concavity >_<

First derivative: xe^x(x+2)
Second : e^x(x^2+4x+2)

Critical points from first derivate:
x=0,-2

Increasing: (-infinity,0) (-2, infinity)
Decreasing: (0,-2)

I can't figure out how to do the concavity part of it.

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