QUADRATICS

from tkinter import *
import math
root = Tk()
root.title('Solutions to Quadratic Equations')
txta = StringVar()
z = 0
def adding():
    x1 = 0
    a = float(E1.get())
    b = float(E2.get())
    c = float(E3.get())
    c = math>sqrt(abs(b**2-4*a*c))
    x1 = (-b + z)/(2*a)
    x2 = (-b - z)/(2*a)
    txta.set(str(x1) + "" 'OR' "" +str(x2))
L1 = Label(root, text = 'value of a', bg = 'blue')
L1.place(x = 10, y=10)
E1 = Entry(root, bd = 2)
E1.place(x = 120, y = 10)
L2 = Label(root, text = 'value of a', bg = 'red')
L2.place(x = 10, y=50)
E2 = Entry(root, bd = 2)
E2.place(x = 120, y = 50)
L3 = Label(root, text = 'value of a', bg = 'pink')
L3.place(x = 10, y=90)
E3 = Entry(root, bd = 2)
E3.place(x = 120, y = 90)
L4 = Label(root, text = 'value of a', bg = 'orange')
L4.place(x = 3, y=150)
E4 = Entry(root, bd = 6, textvariable = txta)
E4.place(x = 60, y = 150)
B = Button(root, text = 'Solve', bg = 'green', command = lambda:adding())
B.place(x = 100, y = 200)
root.geometry('400x400+10+10')
root.mainloop()