Posted by Andrea on .
At what interval is e^(-5x^2) concave up?
I know the second derivative is
but I just can not figure this one out.
Thank you for your help!
- Calculus - Damon,
Then this for second derivative and graph
Note that you did the second derivative correctly. It is easier to write it their way y" = 10e^(-5x^2)(10x^2-1)
It is zero at x = +/- .316
so it is positive for x>.316
and for x <.316