Mathematics 26 Online
OpenStudy (anonymous):

does the limit 0 and negative infinity mean the same?

OpenStudy (saifoo.khan):

no.

OpenStudy (saifoo.khan):

negative infinity means.. -1 -2 -3 -4 ......... (and so on)

OpenStudy (saifoo.khan):

limit zero is 3 2 1 and 0.

OpenStudy (anonymous):

im still confused why at times you can plug in infinity or negative infinity and 0 at other times to get the limit...

OpenStudy (anonymous):

for example, in this link http://tutorial.math.lamar.edu/Classes/CalcI/LimitsAtInfinityI.aspx#Limit_LimAtInf_Ex1a look at example 4 and 5... why can't we use the infinty to plug in for both examples?

OpenStudy (saifoo.khan):

Sorry, i dnt rmmbr Calculas now. :/

OpenStudy (anonymous):

thanks for working anyway!

OpenStudy (anonymous):

lim x ---> a number (including 0) is asking you what happens as we get really close to that number, where is y going? lim x ---> infinity is asking what happens as x gets closer and closer to infinity. With this kind of problem, if the answer is infinity or neg infinity, it just means the value of y will keep growing infinity larger or smaller. If you hit a number as a limit, it means you are hitting an asymptote which is somewhere x is not defined, and so it will always be getting closer and closer to that number, but it will never actually hit that number

OpenStudy (anonymous):

not the same thing

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