It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.
We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.
I don’t know if you are still stuck but I just solved this. your function needs to be told to add those two numbers together both 1 and 2 and 7 and 9. You can’t just tell it to add 1+2 though because then it ceases to work when you attempt to add 7+9.
So look at your code and see where you can identify what is, for example, param1 and param2.
Then where can you identify that you need to add param1 and param2.
Lastly, an area where you can modify param1 and param2 without modifying the original function.