# -*- coding: utf-8 -*-

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
    else:
        return"此方程误解"
print(quadratic(2, 3, 1)) 
print(quadratic(1, 3, -4))