`D(x)=5x-4/3 x^(-2x+1) ` and `C(x)=2x-1/3x^(4x-5) ` :
D(x) has a domain ` x>=0` and range `y>=0 ` . The y-intercept and the only x-intercept are at (0,0). The function is increasing on its domain and thus has no maximum. It has a minimum at x=0.
C(x) has a domain x>0, and the range is approximately y<2.55953. There is no y-intercept, and the two x-intercepts are at approximately x=0.6059 and x=2.1027. The function has a maximum at approximately (1.62748,2.55953) with no minimum. The graph is concave down everywhere on the domain