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Mathematics 25 Online
OpenStudy (dls):

Limits question

OpenStudy (dls):

\[\Huge y=x(\sqrt[x]{3}-1)\]

OpenStudy (dls):

x>infinity

hartnn (hartnn):

did u try taking log on both sides ? L = .... log L = log (....)

OpenStudy (dls):

umm not yet

hartnn (hartnn):

or can you use L'Hopital's rule ? (for that first put x=1/y)

OpenStudy (dls):

we can use L hospital if we write it like.. \[\Huge y=\frac{(\sqrt[x]{3}-1)}{\frac{1}{x}}\] ? that is what I thought..

hartnn (hartnn):

yeah, but simpler way is to first put x =1/y the derivative becomes so much simple...

OpenStudy (dls):

if we take log on both sides,I tried that but log(infinity)..still undefined

hartnn (hartnn):

i didn't try that because i found this way much easier...you ty this

OpenStudy (dls):

why are we substituting x=1/y? didn't quite get that

hartnn (hartnn):

to make it easier to use L'Hopital's rule.

hartnn (hartnn):

it isn't required, but it makes derivative simple

OpenStudy (dls):

any other method?

hartnn (hartnn):

without L'hopitals ? after you plug in x=1/y there's a standard relation you can use. or without x=1/y ?

OpenStudy (dls):

\[\LARGE \frac{1}{y}(3^y-1)\]

OpenStudy (dls):

\[\LARGE \frac{3^y-1}{y}\],oh

OpenStudy (dls):

is it log a?

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