I'm having a brain fart.

log₁₃19

exactly how do I do this?

6/15/2008 10:21:36 PM

What is it that you want to do? Express in decimal form?

6/15/2008 10:32:26 PM

calculate it I reckon, form doesn't matter. I'm just like "wtf" with it.

[Edited on June 15, 2008 at 10:35 PM. Reason : I'm wtf. ]

6/15/2008 10:35:16 PM

is it 13log(19), would that be the way to calculate it?

6/15/2008 11:02:26 PM

log(19)/log(13) or ln(19)/ln(13)

i think...

[Edited on June 15, 2008 at 11:09 PM. Reason : just checked, it's right]

6/15/2008 11:07:35 PM

ahh ok, so take the _{number like this} and use it as the denominator in log(number)/log(base number).

right?

6/15/2008 11:17:54 PM

yes.

you understand that log(x) means a base 10, right? b/c this will work with any base. this would be easier if i had html and could do subscripts.

see: http://www.mathwords.com/c/change_of_base_formula.htm

6/15/2008 11:21:43 PM

ok, so basically just change the nonconvential base (in my case it was a 13) to a base 10 log by doing the following.

log₁₃(19) = log₁₀19/log₁₀13
and then that would be just log19/log13
(and then wouldn't the logs cancel each other out to where it would just be 19/13?)

I wrote out the 10s just to be clear about how my brain was processing it.

6/15/2008 11:43:44 PM

excel says log base 13 (19) = log(19)/log(13)

log(19)/log(13) isn't the same as 19/13

6/16/2008 12:14:41 AM

no, logs do not cancel each other out

6/16/2008 12:19:35 AM

ok.

6/16/2008 12:31:05 AM

so how do I go about solving log19/log13?

6/16/2008 12:40:52 AM

calculator

6/16/2008 1:26:48 AM

dude this is highschool math...not even

6/16/2008 9:49:58 AM

^^^ division

6/16/2008 10:06:35 AM

ti-83 makes it easy. should get 1.14795, but im guessing you need more than just that one number

6/16/2008 3:36:30 PM

ALL YOUR BASE 10 ARE BELONG TO ME




/nerd

6/16/2008 4:55:04 PM

Quote :

"log(19)/log(13) or ln(19)/ln(13)"

6/16/2008 5:46:28 PM

naw my brain woke up after a while, just couldn't post b/c I got suspended for putting "IBTL" in a couple of the RD threads.


thanks for the brain kickstart

6/16/2008 6:02:29 PM

Quote :

"I got suspended for putting "IBTL" in a couple of the RD threads"

wat?

6/16/2008 9:07:08 PM

I miss the good ole days of pre calc

6/16/2008 10:15:46 PM

Quote :

"and then that would be just log19/log13 (and then wouldn't the logs cancel each other out to where it would just be 19/13?)"

BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA

Thanks for the laugh!

I love it when my students cancel out sin/cos/log/square/sqrt/etc in a fraction!

6/16/2008 10:28:18 PM

Quote :

"I miss the good ole days of pre calc Algebra 2"

6/16/2008 10:28:28 PM

oh shit, another gem, albeit not as good as the first one:

Quote :

"so how do I go about solving log19/log13?"

6/16/2008 10:31:25 PM

best troll ever

6/17/2008 2:05:38 AM

Quote :

""and then that would be just log19/log13 (and then wouldn't the logs cancel each other out to where it would just be 19/13?)""

lols

sinx/n = six

6/17/2008 7:39:47 AM

what is the integral of 1/cabin with respect to "cabin"?

answer: natural log cabin!!!11

7/2/2008 7:51:29 PM

actually, I wasn't trolling.

I just needed the information long enough to pass the class, which I did. I'm glad ya'll can laugh about me asking shit that related to a class which taught shit that I will most likely not ever use, and if I did, well hey, that's what computers and calculators are for. And if those are broken or in case of an EMP and I really MUST do this RIGHT THEN, then I guess all the math 1337 could be around for hire.

God forbid anyone ask a question in here, of all places.

7/3/2008 6:27:42 AM

Quote :

"a class which taught shit that I will most likely not ever use"

7/3/2008 7:42:31 AM

I gotta say. I'm a fan of natural logs. Those exponents and crap scared the hell out of me before I learned natural logs.

Quote :

"I love it when my students cancel out sin/cos/log/square/sqrt/etc in a fraction!"

.

Haha when I was in calc I, my professor was saying how one of the examples he did in class was lim (as x -> 8) = 8. Later on at some point in class, there was a problem lim (as x-> 5), and the student put down a sideways 5 as the answer.

7/3/2008 9:24:07 AM

you mean lim x->8= INFINITY?

7/3/2008 9:38:10 AM

also

Quote :

"I'm glad ya'll can laugh about me asking shit that related to a class which taught shit that I will most likely not ever use, and if I did, well hey, that's what computers and calculators are for."

Quote :

"so how do I go about solving log19/log13?"

what good is a calculator if you can't use that either?

[Edited on July 3, 2008 at 9:42 AM. Reason : .]

7/3/2008 9:40:58 AM

[Edited on July 3, 2008 at 1:49 PM. Reason : .]

7/3/2008 1:45:14 PM

^^^ what he said

7/3/2008 9:15:41 PM

to all the people giving me shit:

glad you are so *awesome*.

and yes, I will not be using the info from that class I took in my field. it was a sub class, so get off my balls.

I asked the question because I was using the TI-89 for something, and really didn't want to whip out the manual and look it up myself when one of *awesome* math people could've just spit out the answer, so my bad, I didn't really go RTFM there. my bad.

but hey, its all good, I got through a class I didn't really need but was using a sub for another class that wasn't being offered in the summer, and graduated. yay me. plus the job is quite nice. Even better.

so go right on ahead and be all OMG LOL!! about my thread, I just hope that one day one of you will have a question and people will shit in your face over it.

7/3/2008 11:47:15 PM

Hmm yeah I meant infinity... I copied and pasted the infinity symbol in there and it looked fine when I submitted it. I guess it messed up though.

8

See that should have showed up as an infinity symbol. It looks like one to me.

7/4/2008 6:09:36 PM

∞

7/4/2008 8:40:05 PM

^^^

I generally don't ask questions that I didn't have to know the answer at some point in order to be accepted in college.

7/5/2008 2:19:41 PM

congrats to you then!

while I may have done that stuff in high school, I don't remember it. Probably because I graduated from HS in 96, so I had some time between HS and college. Not to mention math has never been my strong suit. but hey its ok, because on the internet, everyone's a mathematical genius!!

7/6/2008 7:49:06 PM

<--mathematical genius

7/6/2008 9:15:50 PM