ok i got ur problem
i think in the second equation it's xn instead of pn

+

= -p


= q
the next equation has roots
n &
n
therefore
n +
n = -p ( let x
n =y ) ok
n =k and
n = m ( disgustin typin all that)
km=qn
now (

/

)^n + (

/

+1)^n + 1 (since

/

is its root)
=k/m + (

+

)^n/

^n + 1 ( where k and m hav their usual meanings)
takin l.c.m
= {-p^n + (-p)^n}/
n
now if it is a factor then the above term should add upto zero therefore n is even
now that was a tough job to pen down all those xponentials huh..... plzzzzzzz give me rates if i deserve.
if u didn't get this i am there to sort it out