This isn’t how you declare a function that accepts arguments. The list between the () cannot contain a + sign. Usually it’s just a comma-separated list of names. Look at the example. It declares a function that accepts two arguments a and b. The challenge wants you to make a function that also accepts two arguments.
Again looking at the example function, it takes the two arguments and subtract one from the other, then print the result. You want to do the same, except you need to compute for the sum of the arguments.