1. The problem statement, all variables and given/known data find limit of x as it approaches infinite sqrt(x^2+ax)-sqrt(x^2+bx) a and b are not given 2. Relevant equations 3. The attempt at a solution Looking at this equation I first eliminated the square roots. After simplifying i ended up with ax-bx/sqrt(x^2+ax)+sqrt(x^2+bx) I think that this problem cannot be solved b/c a and b are not given. Is this right or is there another way of solving this?