1. The problem statement, all variables and given/known data lim x->4 (1/((sqrt x)-2))-4/(x-4) 2. Relevant equations 3. The attempt at a solution I have made several stabs at this problem. First I tried using values very close to 4 (e.g. sqrt of 4.001) Then I tried rationalizing the expression 1/((sqrt x) -2). That did not work. I also tried the LCD b. Nothing gets me closer to the answer which is 1/4. Pleae help.