import numpy as np


def nullpunkt(a, b):
    return -b/a

def areal(b, npunkt):
    return abs(npunkt*b/2)
    

a_val = -0.5
b_val = 4.0

nullpkt = nullpunkt(a_val, b_val)
areal = areal(b_val, nullpkt)

print('Nullpunkt =', nullpkt)
print('Areal =', areal)