Rewrite $3ln (x - 5) - 2ln (x + 4) + 3ln (x + 5) - 2ln (x - 4)$ together a solitary logarithm making use of the rules for logarithms.

You are watching: Ln (x / 5) = 2

But the answer and also explanation both use $log_8$ and no $ln$.

I"m having actually trouble with just how they come up v the $log_8$. A snapshot is included below:

$egingroup$ uncover the base? The base is $e$ due to the fact that the logs in the expression space $ln$. Is that what you're asking? $endgroup$

$egingroup$ climate there is essential information absent from this question. As it's written appropriate now, the prize is $e$. $endgroup$

$egingroup$ I see you've modified the concern text, which significantly changes the problem. Response involving $log_8$ tho doesn't do sense, since if every you're law is rewriting the provided expression together a single logarithm, then there's no reason to readjust the base. If the answer vital really has actually $log_8$ for that exact trouble you've written, climate the answer vital is incorrect. $endgroup$

**Note:**You deserve to replace every $ln$ with (the same) logarithm to any kind of base, and the result will be identical other than for the base. In various other words, I can replace every $ln$ with a $log_8$ in the price below and it would certainly still be valid.

You begin with this expression:

$$3ln (x - 5) - 2ln (x + 4) + 3ln (x + 5) - 2ln (x - 4)$$

First use the power preeminence on each term:

$$ln <(x - 5)^3> - ln <(x + 4)^2> + ln <(x + 5)^3> - ln <(x - 4)^2>$$

Then usage the product and quotient rule:

$$lnfrac(x-5)^3(x+5)^3(x-4)^2(x+4)^2.$$

re-superstructure

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monitor

edited Aug 2 "16 in ~ 19:51

answer Aug 1 "16 in ~ 20:35

JohnJohn

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If you desire to rewrite it right into one logarithm then, making use of the power dominion on each term of $3ln (x - 5) - 2ln (x + 4) + 3ln (x + 5) - 2ln (x - 4)$ offers

$$eginalign* ln (x-5)^3 + ln (x+5)^3 - (ln (x+4)^2 + ln (x-4)^2) & = ln (x-5)^3(x+5)^3 - ln (x+4)^2(x-4)^2 \ & = ln frac((x-5)(x+5))^3((x-4)(x+4))^2 \ & = ln frac(x^2 - 25)^3(x^2 - 16)^2 endalign*$$

re-publishing

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answered Aug 1 "16 at 20:35

Zain PatelZain Patel

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Glad to view this got reopened. Anyway, it shows up as though the initial question to be asked v $ln$ and also the answer key uses $log_8$ in the solution. Either the question need to have been in terms the $log_8$ or the solution should have remained in terms that $ln$. It"s an error ~ above the problem and answer"s author"s part.

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monitor

answered Aug 2 "16 at 15:30

user307169user307169

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Let $3ln (x - 5) - 2ln (x + 4) + 3ln (x + 5) - 2ln (x - 4) = y$

$e^3ln (x - 5) - 2ln (x + 4) + 3ln (x + 5) - 2ln (x - 4) = e^y$

$frac(x-5)^3(x+5)^3(x+4)^2(x-4)^2= e^y$

From which us *could* perform the complying with if we were yes, really weird.

$log_8 frac(x-5)^3(x+5)^3(x+4)^2(x-4)^2 = log_8 e^y = y*log_8 e$

$y = fraclog_8 frac(x-5)^3(x+5)^3(x+4)^2(x-4)^2log_8 e$

$= ln frac(x-5)^3(x+5)^3(x+4)^2(x-4)^2$

Which really makes me think you composed the question wrong native the very beginning that that the were not $ln$ in the book but $log_8$s.

Can girlfriend scan the *question* indigenous the book? Not just the answer?

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monitor

answer Aug 2 "16 at 20:09

fleabloodfleablood

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