Résolution second degrés en Python

from math import sqrt
 
 
a = int(input("a"))
b = int(input("b"))
c = int(input("c"))
 
 
print(a,"x²+",b,"x+",c,"=0")
 
d = int((b**2)-4*a*c)
 
if d < 0:
    print("Pas de racines")
 
if d == 0:
    print("Une racine: ",(-b)/2*a)
 
if d > 0:
    x1 = (-b-sqrt(d))/2*a
    x2 = (-b+sqrt(d))/2*a
    print("Deux racines: x1= ",x1," et x2 = ",x2)

$python pui.py 
a1
b3
c2
1 x²+ 3 x+ 2 =0
Deux racines: x1=  -2.0  et x2 =  -1.0

 $python tt.py 
  File "tt.py", line 11
    d = int((b**)-4*a*c)
                ^
SyntaxError: invalid syntax