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Math Help - Limits please help

  1. #1
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    Limits please help

    helo, i'm in high school, and right now i'm starting to study alone Calculus, and im new to this concept of "limits"

    I understand the basic rules and properties, but still i don't get the whole picture of the formal definition to much...

    for example when Im asked to find the limit when x aproaches c in any given fucntion... does that mean that in that limit there will be always a hole? (obviously in polynomials divided by a monomial)

    but in other cases i don't get a real good picture...

    sorry for the messy question... is that i'm studying alone..


    if someone could really explain me in any way that i can understand i will be really grateful.
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  2. #2
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    Joined
    May 2010
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    Quote Originally Posted by guidol92 View Post
    helo, i'm in high school, and right now i'm starting to study alone Calculus, and im new to this concept of "limits"

    I understand the basic rules and properties, but still i don't get the whole picture of the formal definition to much...

    for example when Im asked to find the limit when x aproaches c in any given fucntion... does that mean that in that limit there will be always a hole? (obviously in polynomials divided by a monomial)

    but in other cases i don't get a real good picture...

    sorry for the messy question... is that i'm studying alone..


    if someone could really explain me in any way that i can understand i will be really grateful.


    Say you want to know the value of some function at x=c. The limit x->c is the value of the function as x becomes very very close to c. Infinitely close in fact. You can find limits with your calculator entering x=c+.00001 etc and see what the value of the function is as you get very close to c.

    Remember to approach c from the positive and negative sides, if you don't get the same answer the limit does not exist.

    This "hole" you speak of is a good example. The function is undefined at one specific point. So you can't know exactly what the value of the function is there. But if you observe the value of the function as you get very close to that point you can see what the function would be so to speak.

    Also, there doesn't always have to be a "hole". You can find a limit anywhere on a continuous function. For example.

    \lim_{x\rightarrow2}x^2=2^2=4
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