Not understanding "the second argument" on Arithmetic Formatter

The directions state, “The function should optionally take a second argument. When the second argument is set to True , the answers should be displayed…”

I am able to pass all 8 tests, but fail the last two because of the second argument check. Can anybody explain what this means, or where I can go to find more clarity on this? Would really appreciate it, thank you!

By default, when function is called with single argument - list of the problems ie.: arithmetic_arranger(problems_list) function returns just arranged problems.

When second, optional, argument passed in is True - ie.: arithmetic_arranger(problems_list, True) function should return arranged problems, with included results.

Can you post a link to the REPL or the challenge on FCC?

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