from math import sqrt
def kvadratna (a,b,c):
det = b ** 2 - 4 * a * c
if (det>0):
return (-b + sqrt(det))/(2 * a), (-b - sqrt(det))/(2 * a)
elif (det==0):
return -b / (2 * a)
else:
return (-b + sqrt(-det) * j)/(2 * a), (-b - sqrt(-det) * j)/(2 * a)
print (kvadratna (1,0,0))
print (kvadratna (1,3,2))
print (kvadratna (1,0,-1))