I have a math problem i can't seem to figure out. f(x)=(x**2-1)/(2x+1)?

Andrew S

New member
Determine the open interval on which the graph is concave upward.

Determine the open interval on which the graph is concave downward.

I found the second derivative to be 12x+2 than set it equal to zero and got my critical number as 1/6.

It doesnt allow me to put inphinty in my answer so idk how to get these answers. thanks
I'm working with web assign. usually there is a legend but there isn't on this question.
 
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