import math

def quadratic(a, b, c):

if (b*b-4*a*c) < 0 :
    print('number error')
else:
    delt = math.sqrt(b*b-4*a*c)
    x1 = ((-b + delt)/(2*a))
    x2 = ((-b - delt)/(2*a))
    return x1,x2