1. The problem statement, all variables and given/known data limx->infinity (x+2)/(sqrt(81x^2+15)) 2. Relevant equations 3. The attempt at a solution The only thing i could think of doing was rationalizing the denominator to get (x+2)sqrt(81x^2+15) / 81X^2+15 however im pretty sure this is the wrong route cause there doesnt seem to be anywhere to go from here. Any help would be greatly apprciated :D the only problems i seem to ever have difficulty with are with roots in the numerator or denominator. any info in that regard would be of use as well.