draw the graphs of the functions y = f(x), y = f(x) + 2, y = f(x) - 2, y = f(x + 2), and y = f(x - 2).
> f:= x -> x^3;
> plot({f(x), f(x-2), f(x+2), f(x)+2, f(x)-2},x=-5..5,y=-10..10);