=2 or N=-2 and correspondingly x=1 or x=-1.N is an integer, and root(N^2-4) is imaginary for values of N = -1, 0 or +1.all you have to do then is prove that root(N^2 -4) is irrational for all whole number values of N =3 or larger. :)ReplyDeleteBrianThursday, March 18, 2010 8:12:00 PMThanks Eamon.