Determine all real x
is an integer for any integer n.
I thought I got x = ±1, but my working was wrong.
Last edited by JaneFairfax (2008-03-19 09:20:34)
assume that x+1/x is an integer. Squaring gives:
ps. how do i do the sign, that shows that an element belongs to a set in mathcode?
Last edited by Kurre (2008-03-23 01:45:43)