Part (b). So, this is from the introduction of a discreet math book, How to Prove it, idk where to even start with this, and figure that since it's part of the 1st question in the intro that I should know how to do it. But, alas.
32767 is suspiciously close to cubed 32, and first question implies that's important (if you've done it) knowing factors from the first question, you can do some shenanigans close to the first question logic
spoiler
a^n^-b^n^