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OfflineRekkuzo
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Math help.
    #7910169 - 01/21/08 03:48 PM (16 years, 11 days ago)

How do I figure out:

e^2x - e^x =6

How do I solve for x?

I'm stumped.


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OfflineOracle Of Delphi
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Re: Math help. [Re: Rekkuzo]
    #7910177 - 01/21/08 03:50 PM (16 years, 11 days ago)

:boxerface:


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http://dictionary.reference.com/



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InvisibleSell Your Soul
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Re: Math help. [Re: Rekkuzo]
    #7910183 - 01/21/08 03:51 PM (16 years, 11 days ago)

Quote:

Rekkuzo said:
How do I figure out:

e^2x - e^x =6

How do I solve for x?

I'm stumped.




e^2x = (e^x)^2
let z=e^x

z^2-z=6
Solve for z using standard quadratic methods.

Then: x=ln z


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Offlinelearningtofly
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Re: Math help. [Re: Sell Your Soul]
    #7910186 - 01/21/08 03:52 PM (16 years, 11 days ago)

natural log is your friend


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Invisiblefee
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Re: Math help. [Re: Oracle Of Delphi]
    #7910191 - 01/21/08 03:52 PM (16 years, 11 days ago)

wtf does ^ stand for?


--------------------

blankk said to fee:
btw you're a total fucking psychedelic pimp
Turtletotem said:
I want to become a sun worshipper, so next time an atheist smugly asks me where god is, I can point smugly at the sun and laugh my ass off.

Then I drive away in my solar powered piece of shit car, cool stuff man.

And then I go kill a bitch because the flaming orb in the sky told me to do so, and I don't know, oppress a few minorities here and there in the name of nuclear fusion?

Religion is fun.


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InvisibleSell Your Soul
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Re: Math help. [Re: fee]
    #7910196 - 01/21/08 03:53 PM (16 years, 11 days ago)

^ means to the power of ..

Example: 5^3 = 5*5*5
and 6^4 = 6*6*6*6


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OfflineRekkuzo
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Re: Math help. [Re: Sell Your Soul]
    #7910207 - 01/21/08 03:55 PM (16 years, 11 days ago)

Yay, thank you.

I got ln(3)


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Edited by Rekkuzo (01/21/08 04:06 PM)


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OfflineCepheus
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Re: Math help. [Re: Rekkuzo]
    #7910221 - 01/21/08 04:01 PM (16 years, 11 days ago)

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.


--------------------
"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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OfflineOracle Of Delphi
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Re: Math help. [Re: Rekkuzo]
    #7910224 - 01/21/08 04:02 PM (16 years, 11 days ago)

doesnt it mean to look at the post above, as in referencing it?


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http://dictionary.reference.com/



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InvisibleSell Your Soul
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Re: Math help. [Re: Cepheus]
    #7910236 - 01/21/08 04:05 PM (16 years, 11 days ago)

Um, that's not what I said.
Please check above, thanks.


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OfflineRekkuzo
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Re: Math help. [Re: Sell Your Soul]
    #7910294 - 01/21/08 04:16 PM (16 years, 11 days ago)

Thanks for the help. I achieved the correct answer of ln(3).

Is that the simplest way to do it?

>_< I really hate math sometimes. Just when I get the hang of integrating and shit they throw in stuff that requires the quadratic equation, which I barely remember.


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InvisibleSell Your Soul
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Re: Math help. [Re: Rekkuzo]
    #7910304 - 01/21/08 04:18 PM (16 years, 11 days ago)

Depends on how you define "simple".
It is very straight-forward and prone to few errors.
It sure beats punching random numbers into a calculator until something pops up that fits the equation. :lol:


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OfflineCepheus
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Re: Math help. [Re: Sell Your Soul]
    #7910377 - 01/21/08 04:27 PM (16 years, 11 days ago)

I must be missing something here 0.o


--------------------
"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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InvisibleLeftyBurnz
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Re: Math help. [Re: Rekkuzo]
    #7910383 - 01/21/08 04:28 PM (16 years, 11 days ago)

Quote:

Rekkuzo said:
How do I figure out:

e^2x - e^x =6

How do I solve for x?

I'm stumped.




take it, add a crumple, and throw it the fuck out the window.

god i hate math.  :crankey:


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InvisibleSell Your Soul
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Re: Math help. [Re: LeftyBurnz]
    #7910390 - 01/21/08 04:29 PM (16 years, 11 days ago)

You should see some of the equations that I see when I'm tripping balls. :lol:


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InvisibleLeftyBurnz
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Re: Math help. [Re: Sell Your Soul]
    #7910421 - 01/21/08 04:32 PM (16 years, 11 days ago)

Quote:

andyistic said:
Quote:

Rekkuzo said:
How do I figure out:

e^2x - e^x =6

How do I solve for x?

I'm stumped.




e^2x = (e^x)^2
let z=e^x

z^2-z=6
Solve for z using standard quadratic methods.

Then: x=ln z




how in the fuck....... did you actually do that or did you just type a bunch of shit?? lol


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InvisibleLeftyBurnz
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Re: Math help. [Re: Sell Your Soul]
    #7910429 - 01/21/08 04:33 PM (16 years, 11 days ago)

Quote:

andyistic said:
You should see some of the equations that I see when I'm tripping balls. :lol:




really? i see patterns and pictures. :smirk:


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InvisibleSell Your Soul
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Re: Math help. [Re: LeftyBurnz]
    #7910436 - 01/21/08 04:34 PM (16 years, 11 days ago)

I didn't forget everything from my days in school.
The few brain cells that still work happen to be the ones that handle technical details. :shrug:


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InvisibleLeftyBurnz
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Re: Math help. [Re: Sell Your Soul]
    #7910483 - 01/21/08 04:43 PM (16 years, 11 days ago)

where the fuck did you learn that? college? i never saw anything like that in HS. then again i was a tard at math.


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InvisibleSell Your Soul
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Re: Math help. [Re: LeftyBurnz]
    #7910489 - 01/21/08 04:44 PM (16 years, 11 days ago)

Yes, college.
They would never teach that to high school kids,
especially the ones these days who only listen to rap.
I don't know a single rap song that has lyrics which refer to logarithms. :lol:


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InvisibleLeftyBurnz
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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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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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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.


--------------------
"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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InvisibleDieCommie


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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


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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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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.


--------------------


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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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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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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InvisibleDieCommie


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Re: Math help. [Re: Rekkuzo]
    #7911956 - 01/21/08 08:37 PM (16 years, 11 days ago)

You noobs could never help me with my l33t math classes  :einstein:
:sith:


j/k, there are actually some very mathematical individuals I have noticed here through the years... Diploid, Seuss, Trendal, The Cow are a few that come to mind (regulars of the science forum of course)


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OfflineRekkuzo
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Re: Math help. [Re: DieCommie]
    #8010302 - 02/11/08 07:17 PM (15 years, 11 months ago)

Ok, I'm bumping this up for yet another math question.

How do I go about finding the integral of 1/sinx?


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OfflineTangerines
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Re: Math help. [Re: Rekkuzo]
    #8010327 - 02/11/08 07:20 PM (15 years, 11 months ago)

1/sin(x)=csc(x)

Look in your book for the integral of csc(x) because it would be nearly impossible to actually find the answer yourself. It is just an identity you are supposed to know I believe.


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OfflineRekkuzo
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Re: Math help. [Re: Tangerines]
    #8010472 - 02/11/08 07:45 PM (15 years, 11 months ago)

gotcha


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