Find the interval in which the function concave up??
The graph of the function http://www7.0zz0.com/2009/05/03/22/585474959.jpg
is concave up on the interval:
I solve the question and my answer is :
The graph is concave up on (-infinity,-0.5)U(0,infinity)
and I'm sure from my answer but my answer is not included in the choices
and When I use the graphics calculator the graph is concave up on all interval
So what is the correct answer??