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Mathematics 18 Online
OpenStudy (anonymous):

What are the horizontal asymptotes of the logistic growth function f(x)=3/(1+6e^(-2x))?

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (amistre64):

what does e^-inf go to?

jimthompson5910 (jim_thompson5910):

Basically, as x gets larger and larger, what happens to e^(-x)?

OpenStudy (anonymous):

Does it get smaller?

jimthompson5910 (jim_thompson5910):

yes it does

jimthompson5910 (jim_thompson5910):

so as x gets really really really big, e^(-x) gets really really really tiny...effectively making e^(-x) zero

OpenStudy (anonymous):

@swimgirly95 there was an error in your last question range is all real numbers

jimthompson5910 (jim_thompson5910):

So this means that as x gets bigger and bigger, e^(-2x) gets smaller and smaller (using the same logic)

OpenStudy (anonymous):

Okay =)

jimthompson5910 (jim_thompson5910):

so what does that say about the horizontal asymptote?

OpenStudy (anonymous):

I believe it is saying that it will be larger than the verticle one?

jimthompson5910 (jim_thompson5910):

well in this case, there are no vertical asymptotes

OpenStudy (anonymous):

Because y=0, right?

jimthompson5910 (jim_thompson5910):

no because you can plug in any real numbers

jimthompson5910 (jim_thompson5910):

well as x --> infinty, y --> 3 since 6e^(-2x) ---> 0

jimthompson5910 (jim_thompson5910):

So one horizontal asymptote is y = 3

jimthompson5910 (jim_thompson5910):

as x --> -infinty, y --> 0 since 6e^(-2x) ---> infinity

jimthompson5910 (jim_thompson5910):

So another asymptote is y = 0

OpenStudy (anonymous):

okay dokey, sorry, I think I see it now =) THANK YOU!!

jimthompson5910 (jim_thompson5910):

you're welcome

OpenStudy (anonymous):

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