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My first suggestion would be to google two's compliment. It's not a hard concept, and it will come up often for digital courses. If you have specific questions I'll try to help, but 'I don't get X' doesn't help me help you learn it.
The next thing I'd do is determine your inputs and outputs, write them in binary (notation 2's compliment) for ease.
Finally I'd try to figure out how to get from the inputs to the outputs using the given functions.
-MBirchmeier
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