from math import sqrt


def find_discr(a, b, c):
    return b**2 - 4 * a * c


def solve_sq(a, b, c):
    d = find_discr(a, b, c)
    if d < 0:
         return
    if d == 0:
        return -b / (2 * a)
    return tuple(
        (-b + s * sqrt(d)) / (2 * a)
        for s in [-1, 1]
    )