How do you evaluate sqrt(x^2 +2x) - x as x approaches infinity? Calculus Limits Determining Limits Algebraically 1 Answer Cesareo R. Aug 19, 2016 1 Explanation: sqrt(x^2 +2x) - x = sqrt((x+1)^2-1)-x = (x+1)(sqrt(1-1/(x+1)^2))-x so lim_{x->oo}sqrt(x^2 +2x) - x = lim_{x->oo}(x+1)(sqrt(1-1/(x+1)^2))-x = 1 Answer link Related questions How do you find the limit lim_(x->5)(x^2-6x+5)/(x^2-25) ? How do you find the limit lim_(x->3^+)|3-x|/(x^2-2x-3) ? How do you find the limit lim_(x->4)(x^3-64)/(x^2-8x+16) ? How do you find the limit lim_(x->2)(x^2+x-6)/(x-2) ? How do you find the limit lim_(x->-4)(x^2+5x+4)/(x^2+3x-4) ? How do you find the limit lim_(t->-3)(t^2-9)/(2t^2+7t+3) ? How do you find the limit lim_(h->0)((4+h)^2-16)/h ? How do you find the limit lim_(h->0)((2+h)^3-8)/h ? How do you find the limit lim_(x->9)(9-x)/(3-sqrt(x)) ? How do you find the limit lim_(h->0)(sqrt(1+h)-1)/h ? See all questions in Determining Limits Algebraically Impact of this question 3596 views around the world You can reuse this answer Creative Commons License