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Mathematics 7 Online
OpenStudy (marcelie):

help PLEASE !!1

OpenStudy (marcelie):

OpenStudy (marcelie):

NUMBER 74

OpenStudy (marcelie):

@satellite73

OpenStudy (anonymous):

\[\huge y=x^{\frac{5}{x}}\]?

OpenStudy (marcelie):

yes

OpenStudy (anonymous):

you have a choice you can write what this actually is, i.e. \[\huge x^{\frac{5}{x}}=e^{\frac{5}{x}\ln(x)}\] and take the derivative of that one using the chain and product rule

OpenStudy (marcelie):

question how did u get the left side

OpenStudy (anonymous):

or, as your math teacher might say "take the log" get \[\ln(x^{\frac{5}{x}})=\frac{5}{x}\ln(x)\] then take the derivative of that, then multiply again by the original function the work is identical

OpenStudy (anonymous):

you mean how did i get the right hand side?

OpenStudy (marcelie):

yes

OpenStudy (marcelie):

im lost D:

OpenStudy (anonymous):

the definition of \(b^x\) is \[\huge b^x=e^{x\ln(b)}\]

OpenStudy (anonymous):

ok lets not do it that way if it confuses you, lets do it the math teacher way do you have a math teacher?

OpenStudy (marcelie):

yes her lectures are so confusing lol

OpenStudy (anonymous):

ok so the idea is this you know that the the derivative of \(\ln(x)\) is \(\frac{1}{x}\) right?

OpenStudy (marcelie):

yes

OpenStudy (anonymous):

and by the chain rule, the derivative of \[\ln(f(x))=\frac{f'(x)}{f(x)}\] yes?

OpenStudy (marcelie):

yes

OpenStudy (anonymous):

so you do this you have a function you need to find the derivative of you take the log of that function then take the derivative of the log then multiply by the original function at the end

OpenStudy (marcelie):

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