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InvisibleLeftyBurnz
Mr. I Eat Butthole
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Registered: 06/21/05
Posts: 24,570
Loc: FL
Re: Math help. [Re: Sell Your Soul]
    #7910529 - 01/21/08 04:50 PM (16 years, 11 days ago)

lmao. what year were you born anyway?


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InvisibleSell Your Soul
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Re: Math help. [Re: LeftyBurnz]
    #7910536 - 01/21/08 04:51 PM (16 years, 11 days ago)

The year of disco, man!
White collars over jackets all the way. :discodance:


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OfflineCoaster
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Re: Math help. [Re: Sell Your Soul]
    #7910549 - 01/21/08 04:54 PM (16 years, 11 days ago)

this is the best thread ive seen in a while


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OfflineRekkuzo
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Registered: 10/09/07
Posts: 246
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Re: Math help. [Re: Coaster]
    #7910573 - 01/21/08 04:58 PM (16 years, 11 days ago)

Yay, my homework is completed!


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InvisibleLeftyBurnz
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Posts: 24,570
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Re: Math help. [Re: Sell Your Soul]
    #7910594 - 01/21/08 05:00 PM (16 years, 11 days ago)

Quote:

andyistic said:
The year of disco, man!
White collars over jackets all the way. :discodance:




come on man, ill be 23 next month. i dont know what fucking year that is lmao. help a youngin out.


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InvisibleSell Your Soul
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Re: Math help. [Re: LeftyBurnz]
    #7910597 - 01/21/08 05:01 PM (16 years, 11 days ago)

1977.


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OfflineCepheus
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Re: Math help. [Re: Coaster]
    #7910615 - 01/21/08 05:05 PM (16 years, 11 days ago)

Coaster, wtf am I missing here. You're some sort of maths guru. Its actually bugging me now.


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"I only ever hope to reach equilibrium, in Nature's matrix, in line with the meridian" ~ Jehst

:sun: "...and I know that I have to keep breathing, as tomorrow the sun will rise, who knows what the tide will bring?" :sun:

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Send any spare spore prints you might have and help the distribution :grin:

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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: Math help. [Re: Sell Your Soul]
    #7910628 - 01/21/08 05:08 PM (16 years, 11 days ago)

High school kids can do logarithms sometimes.


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InvisibleLeftyBurnz
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Re: Math help. [Re: Sell Your Soul]
    #7910659 - 01/21/08 05:16 PM (16 years, 11 days ago)

Quote:

andyistic said:
1977.




do you have aim? if so, pm me your s/n.


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InvisibleLeftyBurnz
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Re: Math help. [Re: DieCommie]
    #7910693 - 01/21/08 05:23 PM (16 years, 11 days ago)

Quote:

DieCommie said:
High school kids can do logarithms sometimes.




yeah im sure they do that shit in AP and whatnot. i wouldnt know though. i was never L33t enough for that.  i took liberal arts math. haha. i know. call me retarded. whatever.

:flowstone:


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OfflineRekkuzo
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Re: Math help. [Re: Cepheus]
    #7910694 - 01/21/08 05:23 PM (16 years, 11 days ago)

Quote:

Cepheus said:
e^2x - e^x = 6.

log both sides:

ln(2x) - ln(x) = 6

using the laws of logs:
ln(2x/x) = 6

and as andyistic said:

ln(x) = 6
x = e^6.




When you take the natural log of both sides you'd get:
ln(e^2x - e^x) = ln(6)
The function doesn't distribute as if it were a constant or a variable.

That's why I had to go back to algebra to solve the main part of the problem, which gave me:

z^2 - z - 6 = 0

BLAH QUADRATIC!!!

z = 3 or -2
and since z = e^x, x = ln(z); domain of ln(z) is z > 0, meaning ln(3) is the only correct answer.


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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: Math help. [Re: Rekkuzo]
    #7910741 - 01/21/08 05:33 PM (16 years, 11 days ago)

also ln(2x/x) = 6 does not reduce to ln(x) = 6. It reduces to ln(2) = 6 which is of course not right.


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OfflineJeebies
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Re: Math help. [Re: Rekkuzo]
    #7910761 - 01/21/08 05:36 PM (16 years, 11 days ago)

He's right, ln(3) is the only correct answer.

I could do logarithms when I was a junior in high school. I guess I just took tougher classes, but it seemed like good stuff to know.


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OfflineCepheus
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Re: Math help. [Re: Rekkuzo]
    #7910768 - 01/21/08 05:38 PM (16 years, 11 days ago)

unless there is brackets (e^2x - e^x) I don't see why you can't:

e^2x = 6 + e^x

2x = ln(6) + x

x = ln(6)

Fuck knows. I'm still consolidating my learning.. so please correct me wherever its needed.


--------------------
"I only ever hope to reach equilibrium, in Nature's matrix, in line with the meridian" ~ Jehst

:sun: "...and I know that I have to keep breathing, as tomorrow the sun will rise, who knows what the tide will bring?" :sun:

Free Spore Ring Europe
Send any spare spore prints you might have and help the distribution :grin:

Open Source. Freedom.  GNU/Linux

Addicting is not a word.


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InvisibleSell Your Soul
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Re: Math help. [Re: Cepheus]
    #7910774 - 01/21/08 05:39 PM (16 years, 11 days ago)

Cepheus: You need to understand this:

log (a+b) does NOT equal log(a) + log(b)


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InvisibleLiquidkick
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Registered: 05/03/02
Posts: 2,635
Re: Math help. [Re: Rekkuzo]
    #7911131 - 01/21/08 06:36 PM (16 years, 11 days ago)

Wow. Totally thought you need to use Calc.


Its been so long since i have taken any math. Totally didn't even realize to use logs.

Sigh...


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Offlinelearningtofly
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Re: Math help. [Re: Liquidkick]
    #7911331 - 01/21/08 07:01 PM (16 years, 11 days ago)

Dude this is algebra 2 tops.

OP if you are still confused, look in your text book for practice problems or formulas, they should help immensely.


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Edited by learningtofly (01/21/08 07:02 PM)


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OfflineRekkuzo
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Re: Math help. [Re: learningtofly]
    #7911672 - 01/21/08 07:54 PM (16 years, 11 days ago)

OP here, I'm not confused anymore; just more people are, lol.

Andyistic helped me w/ his first post.

And you're right, this is pretty much algebra.  Initially, I just completely forgot to apply it to the problem, because I hadn't been in school for 2 years, but now I remember. :laugh:


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OfflineCoaster
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Registered: 05/22/06
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Re: Math help. [Re: Cepheus]
    #7911687 - 01/21/08 07:56 PM (16 years, 11 days ago)

Quote:

Cepheus said:
Coaster, wtf am I missing here. You're some sort of maths guru. Its actually bugging me now.



y yes i am


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OfflineRekkuzo
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Registered: 10/09/07
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Re: Math help. [Re: Coaster]
    #7911852 - 01/21/08 08:21 PM (16 years, 11 days ago)

We should make this an official math help thread.

Officially.


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