hey hi. i'm just starting differentials and now we are seeing the limits. i have a question. there is one example that goes like this : lim 4 / (x²+2x+1) x--> -1 well with simple calculations using -1(-) and -1(+), i know that the answer is infinity. plus, if i trace the graph, there's an asymptote at -1. but i'm not supposed to use a calculator. well at the exam we can't have one. so i do it by hand. when i plug, let's say, -1.000001 and -0.999999, it gives me 4/0 for both. can i say that it's infinity, or would it have to be 4/0(+)? i feel that it's really easy, yet i'm stuck :( also, if i get something like (1(+))², does it stays 1(+) or does it becomes like 1.0000000002? thanks!