i made a mistake while trying to solve the quadratic formula in python

Question

im a beginner in python, can somebody help me what i did wrong here?

import math def quadratgleichung(a,b,c): loesung1 = - (b/a)/2 + sqrt( ((b/a)/2) * ((b/a)/2) - (c/a) ) loesung2 = - (b/a)/2 - sqrt( ((b/a)/2) * ((b/a)/2) - (c/a) ) return loesung1, loesung2 a = input("Enter a.") b = input("Enter b.") c = input("Enter c.") quadratgleichung(a,b,c) print(f"Die Lösungen der eingegebenen quadratischen Gleichung sind {loesung1} und {loesung2} !\n")

this is what comes out in the console: should i use different variable names in the function or were is the problem?

TypeError Traceback (most recent call last) <ipython-input-11-3207ceaf35b6> in <module> 12 c = input("Enter c.") 13 ---> 14 quadratgleichung(a,b,c) 15 16 print(f"Die Lösungen der eingegebenen quadratischen Gleichung sind {loesung1} und {loesung2} !\n") <ipython-input-11-3207ceaf35b6> in quadratgleichung(a, b, c) 3 4 def quadratgleichung(a,b,c): ----> 5 loesung1 = - (b/a)/2 + sqrt(((b/a)/2) * ((b/a)/2) - (c/a)) 6 loesung2 = - (b/a)/2 - sqrt(((b/a)/2) * ((b/a)/2) - (c/a)) 7 TypeError: unsupported operand type(s) for /: 'str' and 'str'

thanks in advance!!

Does this answer your question? TypeError: unsupported operand type(s) for /: 'str' and 'str' — John Coleman
– John Coleman, Commented Apr 14, 2020 at 17:18
Also, using sqrt rather than math.sqrt is a problem given your import statement, though you could use from math import sqrt — John Coleman
– John Coleman, Commented Apr 14, 2020 at 17:28

DeanAttali · Accepted Answer · 2020-04-14 17:59:05Z

Just by looking at the error, it looks like the variables a, b and c get sent as a string. Then your quadratgleichung method is trying to divide the string types, which it can't do.
Try to convert the a, b, and c to float before calling the quadratgleichung
a = float(input("Enter a.")) and the same for b and c

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