Callisto
  • Callisto
If \(\lim_{x \rightarrow 0^{+}} f(x)=A\) and \(\lim_{x \rightarrow 0^{-}} f(x)=B\), find \(\lim_{x \rightarrow 0^{+}} f(x^3-x)\) How to start?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
hmmm maybe find out whether \(x^3-x\) is approaching 0 from the right or the left as x approaches 0 from the right
Callisto
  • Callisto
How....? FYI, I have the answer :\
slaaibak
  • slaaibak
What's the answer? lol

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slaaibak
  • slaaibak
When in doubt, go with DNE, lol
anonymous
  • anonymous
you can reason as follows: for small positive values of \(x\) we have \(x^3
anonymous
  • anonymous
this is my best guess at any rate i am trying to think up a counter example, one where you wouldn't know the limit, but off the top of my head i cannot, so perhaps what i wrote is correct
anonymous
  • anonymous
in english, as \(x\to 0^+\) we have \(x^3-x\to 0^-\)
anonymous
  • anonymous
so my guess is \(B\) although i have a 50% chance of being right even if my reasoning is faulty
Callisto
  • Callisto
Nice *guess* :\
anonymous
  • anonymous
thnx
Callisto
  • Callisto
Assuming your way to do this question is correct. Similarly, for the question (in part b) \(\lim_{x \rightarrow 0^{-}} f(x^3-x)\) \[x^3-x>0\]So, as \(x \rightarrow 0^+\), \(x^3-x \rightarrow 0^{+}\). And it is A. Hmmm...
Callisto
  • Callisto
*Assume
UnkleRhaukus
  • UnkleRhaukus
is the limit of the function of a sum , equal to the sum of the limits of the function ?
Callisto
  • Callisto
As for part c, \[\lim_{x \rightarrow 0^{+}} f(x^2-x^4)\] \[x^2-x^4>0\] As \(x \rightarrow 0^{+}\), \(x^2-x^4\rightarrow 0^{+}\), so it is A. Seems this trick works, but I don't know why...
HELP!!!!
  • HELP!!!!
teach me how to do this

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