def x2(a, b, c):
    D = b ** 2 - 4 * a * c
    for_user_abc = 'a = ' + str(a) + '; ' + 'b = ' + str(b) + ' ;' + 'c = ' + str(c)
    for_user_D = str(b) + '^2' + ' - ' + '4 * ' + str(a) + ' * ' + str(c) + ' = ' + str(b ** 2) + ' - ' + str(4 * a * c) + ' = ' + str(D)
    if D < 0:
        print(for_user_abc)
        print(for_user_D)
        print('D < 0')
        return 'Нет корней!'
    elif D == 0:
        x = -b / 2 * a
        print(for_user_abc)
        print(for_user_D)
        print('D = 0')
        return x
    else:
        x_1 = (-b + np.sqrt(D)) / (2 * a)
        x_2 = (-b - np.sqrt(D)) / (2 * a)
        print(for_user_abc)
        print(for_user_D)
        return x_1, x_2

x2(14,-5,-1)