Find the local maximum and minimum values of the function f(x)=−x−9/x using the Second Derivative Test. Enter the points in increasing order of their x -coordinates. Enter the first point in the form (x,y) : Preview The sign of f′′(x) at this point is Based on your answer, the conclusion is Enter the second point in the form (x,y) : Preview The sign of f′′(x) at this point is Based on your answer, the conclusion is