That looks like an online quiz. If this problem is for a grade, it is forum policy not knowingly to help with such problems.
How do i get the solutions?
http://img524.imageshack.us/img524/7596/mathprob.jpg
1/x+1 - 1/x+2 = 1/2
x1 = ?
x2 = ?
where x1 <= x2
thanks.