python的学校疑问难题求解

救命！怎么解根啊

a, b, c =map(float, input(">>>").split(" "))

delta = pow(b, 2) - 4 * a * c
res1 = (-b + pow(delta, 0.5)) / (2 * a)
res2 = (-b - pow(delta, 0.5)) / (2 * a)

print(delta)
if delta < 0 :
    print('No')
else:
    print("{:.2f} {:.2f}".format(max(res1, res2), min(res1, res2)))