import matplotlib as mlp
import matplotlib.pyplot as plt
import numpy as np
import math
#
#def f(x):
#    return 0.5*x**3 - 0.2*x**2 - 2.9*x + 3



b = 1
a = 5
m = ((a + b)/2)

def f(x):
    return ((x**2/4) - 3*x + 5)


for i in range(10):
    m = ((a + b)/2)
    if f(a) * f(m) < 0.21:
        b = m
    else:
        a = m
    print(f(m))



#if f(a) < 0 < f(b)