提个问题弄不出来啊啊

import math

def quadratic(a,b,c):
    delta=b*b-4*a*c
    if delta>0:
        x1=(-b+math.sqrt(delta))/(2*a)
        x2=(-b-math.sqrt(delta))/(2*a)
        return (x1,x2)
    elif delta == 0:
        x=-b/(2*a)
        return (x,x)
    elif delta<0:
        return ()

a=eval(input())
b=eval(input())
c=eval(input())
print(quadratic(a,b,c))