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Math Help Forum: Find the limit if it exists

  1. Sep 12, 2012 #1
    I'm having a really difficult time understanding limits from the graph. I don't completely understand how to find if the limit exists or not. I tried to do these for my homework but I don't know if they are right. Could someone please help me understand limits?
    152hn36.jpg
     
  2. jcsd
  3. Sep 12, 2012 #2

    jbunniii

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    I'm having trouble reading the little + and - symbols in your limits. Is there any way you can display this at a higher resolution?

    [edit] just noticed that in b and c, the limits are as x approaches -2, whereas in d and e, x approaches 2.

    The first one that looks wrong is b. Is that the limit as x approaches -2 from the positive side? If so, the answer is not 1. To answer this question, ignore everything to the left of x = -2, and ignore what happens at x = -2 itself. Focus only on what the graph is doing as x approaches -2 from the right side. What number is the graph approaching?
     
  4. Sep 12, 2012 #3
    B and C are -2, whereas D and E are +2. Going blind looking at it.
     
  5. Sep 12, 2012 #4

    vela

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    The limits appear to be:
    \begin{align*}
    \lim_{x \to -3} f(x) \\
    \lim_{x \to -2^+} f(x) \\
    \lim_{x \to -2^-} f(x) \\
    \lim_{x \to 2^+} f(x) \\
    \lim_{x \to 2^-} f(x) \\
    \lim_{x \to 4^-} f(x) \\
    \lim_{x \to 4^+} f(x) \\
    \lim_{x \to 6^+} f(x)
    \end{align*}
     
  6. Sep 12, 2012 #5

    vela

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    Explain how you arrived at your answers, so we can see where you're going wrong.
     
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