Answer:
IPv4 address. I guess, it's kind of tricky. lol
Since all terms have an x in them, you can first factor that out, yielding:
f(x) = x(x² - 6x + 9)
Then you are looking for numbers that multiplied give 9 and added give -6, which is -3 and -3. So the final factorization is:
f(x) = x(x-3)²
Swapping pages of memory from core memory and disk is called swapping in Unix, and paging in Microsoft.