import graph_pi;

real f(real x){return -x^3/8-x^2/4+2x;}

graphicrules(unit=2cm,
             xmin=-5, xmax=.25, ymin=-5, ymax=0);

draw(graph(f));
cartesianaxis();
draw(graph(new real(real x){return x;}), grey);

draw(recursivegraph(f,-1.5,n0=1,n=12),
     recursiveoption(Label(scale(.8)*"\alpha",align=2N),
                     px=dashed,
                     xaxismarker=scale(2)*MarkFill[0],
                     automarker=nomarker,
                     circuitarrow=Arrow(position=Relative(.5))),
     .8red);