Why Does the Limit of \(x^2 - \frac{1}{x}\) as \(x\) Approaches 0 Not Exist?

  • Thread starter Thread starter carbz
  • Start date Start date
  • Tags Tags
    Limit
carbz
Messages
35
Reaction score
0
[SOLVED] Just one more limit problem.

Homework Statement


Find the limit


Homework Equations


\lim_{x \rightarrow 0} (x^2 - \frac{1}{x})


The Attempt at a Solution


I got does not exist for this limit. This is since, when you break it down to two parts, the 1/x is undefined at 0.
 
Physics news on Phys.org
That's correct.
 
allright, thank you
 
The fact that a function is undefined at a point does not imply the limit does not exist at that point.
 
It is infinite on both sides of the point, it doesn't exist.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top