Homework Help v1.3 - Page 9

pkzild · 16-12-2005, 06:47 AM

Quote:

Originally Posted by canza

^ thx bat! but its too late....I failed my test....

LOLLLL

ames3 · 18-12-2005, 06:02 AM

awww sorry to hear=(

Sp1k3 · 19-12-2005, 12:41 AM

Quote:

Originally Posted by canza

^ thx bat! but its too late....I failed my test....

PWN'ed.

Sorry to hear that.

pkzild · 19-12-2005, 04:47 AM

ahhh this is drivin me crazzzyy kazman says S lnx dx = 1/x but thats soooo not right i swearrrrr

(S is the integral symbol thingy btw)

can anyone beg to difffer?

ames3 · 19-12-2005, 04:51 AM

The derivative of lnx= (1/x) the integration of lnx, u need to use integration by parts or memorize it such that it will = xlnx-x

pkzild · 19-12-2005, 04:53 AM

wowww fast reply thanks!!! working backwards from xlnx-x it works!!

*Denny Crane* · 19-12-2005, 04:56 AM

sorry eztool
just convert lnx to e^lnx and integrate that way

ames3 · 19-12-2005, 05:01 AM

i never saw it done...can u show me..i am intrigged..how would u go about tha way.

*Denny Crane* · 19-12-2005, 05:16 AM

just scrap what i said
i was trying to remember something i did over 18 months ago

damn i getting like batgirl

batman555 · 19-12-2005, 04:54 PM

^ They say that lovers often pick up each other's habits. :p

Integration by parts:
You have your integral. Use the substitution

uv - integral(v*du)

You can assign u to be anything, but it's more convenient to choose something that is easier to differentiate.

Letting u = lnx and dv/dx = 1 (that is the coefficient of dx),
we get:

u = ln x
dv = 1
.: du = 1/x dx and v = x

Making the substitution:
lnx*x - integral(x*1/x dx)

The x's drop out and you get:
xlnx - integral(1dx)

You know that the integral of dx = x
.: integral(lnx dx) = xlnx - x

Yes! I did it without my Calculus text!

RagingVortex · 20-12-2005, 12:58 AM

How does the Second Partials Test for finding relative extreme of functions of two variables work? I know d=fxx(a,b)fyy(a,b)-[fxy(a,b)]^2, but what is this "d" supposed to stand for?

RagingVortex · 24-12-2005, 06:23 AM

no takers? come on, SOMEONE has to have taken multivariate calculus =\

silversuriv · 24-12-2005, 06:30 AM

Quote:

Originally Posted by batman555

^ They say that lovers often pick up each other's habits. :p

Integration by parts:
You have your integral. Use the substitution

uv - integral(v*du)

You can assign u to be anything, but it's more convenient to choose something that is easier to differentiate.

Letting u = lnx and dv/dx = 1 (that is the coefficient of dx),
we get:

u = ln x
dv = 1
.: du = 1/x dx and v = x

Making the substitution:
lnx*x - integral(x*1/x dx)

The x's drop out and you get:
xlnx - integral(1dx)

You know that the integral of dx = x
.: integral(lnx dx) = xlnx - x

Yes! I did it without my Calculus text!

amazing.. i'm in 9th going to take algebra 2. gonna suck when i have to learn that stuff.

Chise · 24-12-2005, 10:52 AM

..............

anime_master2005 · 24-12-2005, 06:41 PM

lol. half of the ppl are jus talkin about help. no ones really needin it! anywayz i can giv u help in math up to gr. 10 although im a 13 year old! and i aint no nerd! anywayz, u need sum help up to grade 10, i can help u out (particularly math). anywayz, i no sum of u guy r in uni, and hi skool so i cant help u out that much! i'll jus cover the lower grades. guys plz add to my rep.

Revenant · 25-12-2005, 01:43 AM

Haha you guys just wait for next year, maybe I'll bring a lot of stuff for you to solve (hehe)

Bushido · 27-12-2005, 09:10 PM

Alright..here's one:
Compare the Hardy - Weinberg theory with the concept of Microevolution. How do the criteria of Microevolution influence the process of allopatric speciation?
giving us essay assignment over the break...oa(m$*BR*n2394op2nu2394o223489yo82375/324%

edit: heh, I already got it. no worries

iQing · 02-01-2006, 10:02 PM

Not having the right mood to study?
Need motivation?

I have created a motivational poster
It has cheerful motivational words to motivate you to study well and prepare for exam

I have chosen a graduation picture as the whitewashed background and a cheerful anime character to cheer you up

Feel free to download the poster and print it... stick it on you wall

Sorry if it is not so nicely made

If you have created any motivational poster,
please share it here

thanks

aka fuku · 03-01-2006, 12:44 AM

hello can someone help me with these types of math questions

This is an example

If q=4, what is 3d(4-3q) in terms of d

The book says the answer is -24d but i don't understand how it came to that can someone please tell me how do you work it out i'm really hopeless in math ^-^

~~Sparda~~ · 03-01-2006, 12:46 AM

Quote:

Originally Posted by batman555

1. Convert the silver to moles.
2. Multiply by the ratio of the stoichiometric coefficients to get moles of silver.
3. Convert moles of silver back to grams.

..... maybe i shouldnt have slept in class in high school

18-12-2005, 06:02 AM	#162
ames3 Hunter-nin Join Date: Sep 2004 Location: NY Posts: 2,407 My Mood: Rep Power: 32 Total Awards: 1	Re: Homework Help v1.3 awww sorry to hear=( __________________ - ^^is from Farre ty ty lots

19-12-2005, 04:47 AM	#164
pkzild Special Jounin Join Date: Oct 2004 Location: Canada Posts: 3,308 Rep Power: 34 Total Awards: 1	Re: Homework Help v1.3 ahhh this is drivin me crazzzyy kazman says S lnx dx = 1/x but thats soooo not right i swearrrrr (S is the integral symbol thingy btw) can anyone beg to difffer? __________________

19-12-2005, 04:51 AM	#165
ames3 Hunter-nin Join Date: Sep 2004 Location: NY Posts: 2,407 My Mood: Rep Power: 32 Total Awards: 1	Re: Homework Help v1.3 The derivative of lnx= (1/x) the integration of lnx, u need to use integration by parts or memorize it such that it will = xlnx-x __________________ - ^^is from Farre ty ty lots

19-12-2005, 04:53 AM	#166
pkzild Special Jounin Join Date: Oct 2004 Location: Canada Posts: 3,308 Rep Power: 34 Total Awards: 1	Re: Homework Help v1.3 wowww fast reply thanks!!! working backwards from xlnx-x it works!! __________________

19-12-2005, 05:01 AM	#168
ames3 Hunter-nin Join Date: Sep 2004 Location: NY Posts: 2,407 My Mood: Rep Power: 32 Total Awards: 1	Re: Homework Help v1.3 i never saw it done...can u show me..i am intrigged..how would u go about tha way. __________________ - ^^is from Farre ty ty lots

19-12-2005, 04:54 PM	#170
batman555 Kazekage Join Date: Jan 2005 Posts: 12,554 My Mood: Rep Power: 666 Total Awards: 8	Re: Homework Help v1.3 ^ They say that lovers often pick up each other's habits. :p Integration by parts: You have your integral. Use the substitution uv - integral(vdu) You can assign u to be anything, but it's more convenient to choose something that is easier to differentiate. Letting u = lnx and dv/dx = 1 (that is the coefficient of dx), we get: u = ln x dv = 1 .: du = 1/x dx and v = x Making the substitution: lnxx - integral(x1/x dx) The x's drop out and you get: xlnx - integral(1dx) You know that the integral of dx = x .: integral(lnx dx) = xlnx - x Yes! I did it without my Calculus text!* __________________ Pretty tennis boys [ Fanfictions: Reborn! + Naruto + more ]

20-12-2005, 12:58 AM	#171
RagingVortex Hunter-nin Join Date: Apr 2005 Location: in the mountains Posts: 2,271 My Mood: Rep Power: 20	Re: Homework Help v1.3 How does the Second Partials Test for finding relative extreme of functions of two variables work? I know d=fxx(a,b)fyy(a,b)-[fxy(a,b)]^2, but what is this "d" supposed to stand for?

24-12-2005, 06:23 AM	#172
RagingVortex Hunter-nin Join Date: Apr 2005 Location: in the mountains Posts: 2,271 My Mood: Rep Power: 20	Re: Homework Help v1.3 no takers? come on, SOMEONE has to have taken multivariate calculus =\

24-12-2005, 10:52 AM	#174
Chise Academy Student Join Date: May 2005 Posts: 6 Rep Power: 0	Re: Homework Help v1.3 .............. Last edited by Chise; 26-11-2007 at 08:08 AM.

24-12-2005, 06:41 PM	#175
anime_master2005 Chuunin Join Date: Dec 2005 Location: The Village Konoha Posts: 294 My Mood: Rep Power: 12	Re: Homework Help v1.3 lol. half of the ppl are jus talkin about help. no ones really needin it! anywayz i can giv u help in math up to gr. 10 although im a 13 year old! and i aint no nerd! anywayz, u need sum help up to grade 10, i can help u out (particularly math). anywayz, i no sum of u guy r in uni, and hi skool so i cant help u out that much! i'll jus cover the lower grades. guys plz add to my rep. __________________ Please positive rep me if I helped you or if I made a good point, thanks.

25-12-2005, 01:43 AM	#176
Revenant Special Jounin Join Date: Mar 2005 Location: Germany Posts: 3,176 My Mood: Rep Power: 39	Re: Homework Help v1.3 Haha you guys just wait for next year, maybe I'll bring a lot of stuff for you to solve (hehe)

27-12-2005, 09:10 PM	#177
Bushido ANBU Join Date: Jan 2005 Location: NJ Posts: 1,358 Rep Power: 20 Total Awards: 1	Re: Homework Help v1.3 Alright..here's one: Compare the Hardy - Weinberg theory with the concept of Microevolution. How do the criteria of Microevolution influence the process of allopatric speciation? giving us essay assignment over the break...oa(m$BRn2394op2nu2394o223489yo82375/324% edit: heh, I already got it. no worries Last edited by Bushido; 01-01-2006 at 05:59 PM.

03-01-2006, 12:44 AM	#179
aka fuku Hunter-nin Join Date: Dec 2005 Location: y should i tell u... stalker Posts: 2,832 My Mood: Rep Power: 25	Re: Homework Help v1.3 hello can someone help me with these types of math questions This is an example If q=4, what is 3d(4-3q) in terms of d The book says the answer is -24d but i don't understand how it came to that can someone please tell me how do you work it out i'm really hopeless in math ^-^ __________________