def smaller_root(a, b, c):
    """
    Returns the smaller root of a quadratic equation with the
    given coefficients.
    """
    dis = (b **2) - (4 * a * c)

    if dis < 0:
        return "Error: No real solutions"
    else:
        s = (-b - (dis ** 0.5)) / (2 * a)
        return s