I am to determine the interval on which f(x)=x-x^-2 is increasing. I came up with the derivative of f`(x) =x-x^-2 as f`(x)=1+2/x^3. Having said that, the graph on the left side of the y axis seems to travel in a positive direction until it gets to the y axis, then goes to -infinity. The graph on the right side of the y axis seems to go from o to infinity. Am I doing this correctly? Is the increasing interval (o, to infinity)?