#1
i have some natural log problems with the directions "simplify":

1. 1/2ln9+ ln12 - 2ln3

i plug this into my graphing calculator and get:

3.381227841

is that the answer? or do i raise the e to that so that: e^(3.381227841)=4

which is the answer?

thanks so much, my final is tomorrow and i dont know how to do that
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Last edited by axeslinger01 at Jun 9, 2008,
#3
Quote by Twisted Magnum
Its 5.666666666666666666


is that for real?
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Quote by primusfan
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#5
I think it's asking you to condense (I think that's the correct term, correct me if I'm wrong.)
IIIIIII
#6
I don't understand, just plug in ln12-ln3 and that's the answer.

Edit: I mean I don't understand why your calculator would not give you the answer if you plugged it in correctly.
#7
My random answer of the day: 1.38629436

or maybe (Ln 9^1/2)(ln 12) / (ln 3^2)=

ln 108^1/2 / ln 3^2.
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Last edited by Ticket48 at Jun 9, 2008,
#8
IIRC, something like this:

ln4

Correct me if I'm wrong, it's been awhile.

1/2ln9+ ln12 - 2ln3
ln9^(1/2)+ln12 - ln3^(2)
ln3+ln12 - ln 9
ln (36/9)
ln4
IIIIIII
#11
Quote by Redsx158
the answer is ln4 you have to condense it

1/2ln9 is the same as ln 3
ln12 is ln12
2ln3 is the same as ln 9

addeition in logs can be seen as multiplying and subtraction as division

therefore 1/2ln9 + ln12 - 2ln3 is ln(12x3/9) or ln4

truth right here...
#12
simplify means your supposed to come up with a new way of saying it... in otherwords combine all the ln's into 1 ln... not solve it...

in other words using simpler explanation... even if they told you x = 2 the simplify of 2x + 4x - 1 x = 5x
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#13
You're wrong. 1/2ln9 = ln3
ln3-2ln3= -ln3 Therefore,
ln12- ln3= whatever the calculator says, I don't know where my Ti 84 is at right now.
#14
Quote by Redsx158
the answer is ln4 you have to condense it

1/2ln9 is the same as ln 3
ln12 is ln12
2ln3 is the same as ln 9

addeition in logs can be seen as multiplying and subtraction as division

therefore 1/2ln9 + ln12 - 2ln3 is ln(12x3/9) or ln4


dude thank you soooo much, i have a final in this **** tomorrow and i'm pulling my hair out. i went back and did the review page and got it right thanks to you
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Quote by primusfan
you shoulda lynched that nigger.

*spits in spittoon and feels up his cousin*
#15
Quote by Burdell
truth right here...

yeah. simplifying means write it in simplest terms. besides, scientifically speaking, an answer should never be approximated. write it in algebraic terms or in root form...

EDIT:i posted something worth a damn
#16
Quote by Papagenu
You're wrong. 1/2ln9 = ln3
ln3-2ln3= -ln3 Therefore,
ln12- ln3= whatever the calculator says, I don't know where my Ti 84 is at right now.


While 1/2ln9 does equal 3, the rest of what you said doesn't work. ln3-2ln3 does NOT equal -ln3. Logs don't work that way. 2ln3 is equivalent to ln3^2 or ln9 and -(1)ln3 would be ln(1/3). See above, the answer is ln4.

Also, ln 3- 2ln3 (ln9, see above.) is done wrong anyway. Subtraction between logs is division, ie, ln(3/9).
IIIIIII
Last edited by synopsize at Jun 9, 2008,
#17
Quote by synopsize
While 1/2ln9 does equal 3

I feel stupid cause I typed that into google and it came out differently. Anyone know why?
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#18
Quote by Ticket48
I feel stupid cause I typed that into google and it came out differently. Anyone know why?

It probably sees ln as two variables. Not the natural log of something.

Edit: Nevermind. Did you use parentheses? I checked Google and it said you have to use parentheses when asking it to evaluate logs.
Last edited by Burdell at Jun 9, 2008,
#21
Quote by Ticket48
I feel stupid cause I typed that into google and it came out differently. Anyone know why?


(for some reason I'm really enjoying math tonight.)

It reads it as (1/2) * ln9 instead of (1/2)ln9. Meaning that it solves ln9 (ln9 being an exponent [e^x=9], which comes before multiplication in the order of operations) instead of simplifying the equation to ln9^(1/2) (ln3)

EDIT: Oops, mixed up 9s and 3s.
IIIIIII
Last edited by synopsize at Jun 9, 2008,
#22
Quote by synopsize
(for some reason I'm really enjoying math tonight.)

It reads it as (1/2) * ln9 instead of (1/2)ln9. Meaning that it solves ln9 (ln9 being an exponent, which comes before multiplication in the order of operations) instead of simplifying the equation to ln9^(1/2) (ln3)

EDIT: Oops, mixed up 9s and 3s.

Dang, that messed me up quite a bit. arg. Well, thanks for the explination.
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