NameError: name 'x1' is not defined

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#1

hi friends.
I’m tring to figure out a quadratic equation, by using another function.
But when I tried calling the first function, I got an error:

def quadratic_equation(a, b, c):
    import math
    d = int(b) ** 2 - 4 * int(a) * int(c)
    if d < 0:
        x1 = None
        x2 = None
    elif d == 0:
        x1 = (-1 *int(b) + math.sqrt(int (b) ** 2 - 4 * int(a) * int(c))) / 2 * int(a)
        x2 = None
    else:
        x1 = (-1 * int(b) + math.sqrt(int(b) ** 2 - 4 * int(a) * int(c))) / 2 * int(a)
        x2 = (-1 *int(b) - math.sqrt(int (b) ** 2 - 4 * int(a) * int(c))) / 2 * int(a)
    return x1, x2

def quadratic_equation_user_input():
    a,b,c= input("Insert coefficients a, b, and c").split()
    quadratic_equation(a, b, c)
    if a==0:
        print("The parameter 'a' may not equal 0")
    else:
        if x1!=None and x2!=None :
            print("The has 2 solutions:", x1, "and", x2)
        elif x2 == None:
            print("The equation has 1 solutions:", x1)
        elif (x1 and x2) == None:
            print("The equation has no solutions")
quadratic_equation_user_input()

this is the error:
if x1!=None and x2!=None :
NameError: name ‘x1’ is not defined

I don’t know how I can fix it.
thank you!

#2

X1 and x2 are defined in quadratic_equation and returned. quadratic_equation_user_input cannot see X1 and x2 because they exist only in quadratic_equation. They way you use then is by storing the return of quadratic_equation into variables, you then use those variables to get the expected values for X1 and x2.

#3

thank you!
I understand it.
But how can I really solve it?
(maybe I didn’t understand your last line)

#4

Through standard assignment.

def return_sonething():
    return 10, 11

a, b = return_something()

In that example a will equal 10 and b will equal 11.

#5

Thank you. sorry about the basic question.