Since there are 5 (3xy)s, you just write it as: (3xy)^5. Since it asks for exponential notation, I don't think you need to simplify that...
Note that each term is the same. In this case, you can 'simplify' it into a power sign.
(3xy)^5 will be your answer
(3xy)^5 = (3xy)(3xy)(3xy)(3xy)(3xy).
hope this helps
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