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- amistre64

Whats the integral of ln(x+2)? Im thinking its along the same lines as ln(x)...

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- amistre64

Whats the integral of ln(x+2)? Im thinking its along the same lines as ln(x)...

- katieb

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- amistre64

x ln(x+2) - x + C .... maybe?

- anonymous

let u = x + 2

- anonymous

The way i am looking at it would end up as (1/x+2)

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- amistre64

zbay, thats derivative I think ;)

- myininaya

let u=x+2. so du=dx. therefore we have int(lnu)=u(lnu)-u

- anonymous

<---- I am a big dummy 8(

- amistre64

when the sign say push, you pull right ;)

- myininaya

=(x+2)ln[x+2]-(x+2)+c

- anonymous

You're on to me already

- amistre64

myin, thanx; thats what I was thinking...

- myininaya

you're welcome

- amistre64

hows this look?

- myininaya

looks fine. I would have just a u substitution. let u=x+2 so du=dx
Since u=x+2 then x=u-2 which if we multiply by 6 we have 6x=6(u-2).
so we have int(6(u-2)/u,u)=6int(1-2/u,u)=6int(1,u)-6int(2/u,u)=6u-12lnu+C
=6(x+2)-12(x+2)+C

- myininaya

oops thats suppose to read 6(x+2)-12ln(x+2)+C

- amistre64

.... i still need a looooottt of practice with integrals ;) thanx

- myininaya

you're super smart amistre. where do you go to college?

- amistre64

down here in florida; at the local community college

- amistre64

finally get to take calc1 and stats during the summer.... if the class dont get canceled that is

- myininaya

mathematics is a huge. i still don't know alot of it, and I have a masters

- amistre64

:) I am working on my masters in math.... i figure at least 4 more years ..

- myininaya

I want to get my phd in applied science. I am going to do a research in cryptography with someone in the computer science department who knows less math than me, so it should be interesting since I don't know alot of computer science. I'm mainly interested in the theory of computer science.

- amistre64

thats sounds fun :) I had started out thinking of getting a computer degree since I write my own programs... but math is my best subject since I was a kid :)

- myininaya

me too

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