- Curve Sketching Course Packet on classifying critical points using the second derivative test Determine the x-coordinates of the relative extrema of the function g(x) = xe5x Enter each answer as a comma separated list of values. The order of the values does not matter. Enter DNE if g(x) does not have any relative maximum or minimum values, respectively. x-coordinates of the relative maxima = x-coordinates of the relative minima =