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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Okay so I tried your code and it seems that for the test case (-y+11)(-55y-6) your answer is y^2-5y-66, which is wrong.
The answer should be 55y^2-599y-66.
I think maybe it's caused by the "-y" in the first bracket which doesn't have a number coefficient?
By the way my test case doesn't include (y-11)(y+6).
Please check your code again and let me know if there are any further problems.