WOW! You have been so much help!
I got
X= sqrt of (1/3)
So the function is concave down for all X values between -< X < + of sqrt (1/3)
I have been going crazy trying to figure this is out! Thank you for your time :)
Ok, so for the 1st derivative I have:
-2x/(x^2+1)^2
Second:
-6x^2-2/ (x^2+1)^2
Do I need to factor the denom? Also, you stated that I need to determine the values on either side of the inflection points, I should do that with my calculator, right? So, if I have this correct...
Homework Statement
For what intervals is g(x) = 1/(x^2+1) concave down?
Homework Equations
Quotient Rule
The Attempt at a Solution
OK, so I have found the first and second derivative, but I am confused as to how I should use them to find where the function is concave down. Do I...
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