new

x0=1.5
x1=2
for i in range(10):
    x=(x0+x1)/2
    y=2*x*x*x-5*x-1
    y0=2*x0*x0*x0-5*x0-1
    y1=2*x1*x1*x1-5*x1-1
    if y>0:
        x0=x0
        x1=x
    elif y<0:
        x0=x
        x1=x1
    print(x0,x,x1,y)