a=[[1,2,1],[1,2,-13],[2,4,-1],[5,24,-4]]
from math import sqrt
def kv(a,b,c):
    d=b*b-4*a*c
    if (d<0):
        print "d<0"
        return
    x1=(-b+sqrt(d))/(2*a)
    x2=(-b-sqrt(d))/(2*a)
    if (d==0):
        x1=-b/(2*a)
        print x1
        return
    print  x1,x2
for i in range (len(a)):
    n1=a[i][0]
    n2=a[i][1]
    n3=a[i][2]
    kv(n1,n2,n3)