1. The problem statement, all variables and given/known data Find the limit of x/(sqrt(1+3x)-1) as x approaches 0. 2. Relevant equations The limit laws. 3. The attempt at a solution I'm really stuck. I've tried multiplying all of it by (sqrt(1+3x)+1)/(sqrt(1+3x)+1), but that didn't work. I can't seem to get that 0 out of the denominator. What am I missing?