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How would you do this integral?

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user098123
Posts: 6072 - Karma: 18
I can't figure this one out, the integral is:

Int(1/sqrt(-2x-x^2))
Mar 19 2007 5:17PM
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Jake...
Posts: 11976 - Karma: 296
excuse me ?
Mar 19 2007 5:18PM
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user098123
Posts: 6072 - Karma: 18
Its calculus, maybe you'll learn it when you're older.
Mar 19 2007 5:19PM
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freezed
Posts: 12973 - Karma: 500
Click for larger image
Mar 19 2007 5:21PM
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user098123
Posts: 6072 - Karma: 18
i plug it into my calculator and i get the arcsin(x+1), no idea how it gets that tho.
Mar 19 2007 5:23PM
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vermontsteez
Posts: 924 - Karma: 19
lawl calc. is going to suck
Mar 19 2007 5:27PM
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user098123
Posts: 6072 - Karma: 18
i figured it out...-2x-x^2 is the same as 1-1-(-2x-x^2) which can also be rewritten 1-(1-(-2x-x^2)) which factors to 1-(x+1)^2, and then when you take the integral of 1/(1-(x+1)^2) you get sin^-1(x+1)
Mar 19 2007 5:31PM
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user098123
Posts: 6072 - Karma: 18
i forgot the square root in the integral, but aside from that i'm pretty sure its right.
Mar 19 2007 5:32PM
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Greenish
Posts: 2047 - Karma: 367
i just had a nice calc test. real fun
Mar 19 2007 5:32PM
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Jake...
Posts: 11976 - Karma: 296
maybe i would have used that "burn" in grade school to feel big.


i have taken calculus.
Mar 19 2007 5:32PM
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clrumivier4life
Posts: 2429 - Karma: 9
Yeah, you're right.  I was just about to type all that out, thank god you already got it.  I hate explaining math.
Mar 19 2007 5:34PM
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Nihiriju
Posts: 2061 - Karma: 27
haha i just had a second midterm for intergrals, i am pretty sure i failed, i hate math. 
Mar 19 2007 6:37PM
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49566738265
Posts: 0 - Karma: 7,704
don't think that was a burn bro. and if you had taken calc it should have been easy to figure that out.


but ya you got it right to the threadmaker. if you factor and rewrite its not to bad. you can also use a natural log but that doesn't make it much easier.
Mar 19 2007 7:03PM
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Itsbackfliptime
Posts: 18901 - Karma: 75
haha wait until you do double and triple integrals in Calc III.

I can't even remember how to do simple integrals.
Mar 19 2007 7:29PM
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bobs
Posts: 4801 - Karma: 868
simplify and it becomes sin rule i believe
Mar 19 2007 7:44PM
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dman1260
Posts: 899 - Karma: 13
Click for larger image
Mar 19 2007 7:54PM
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Jamesl48
Posts: 547 - Karma: 10
Calculus is why I no longer want to pursue an engineering major
Mar 19 2007 8:01PM
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ECGove
Posts: 1947 - Karma: 75
haha nice
Mar 19 2007 8:03PM
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clrumivier4life
Posts: 2429 - Karma: 9
I didn't think double and triple integrals were all that hard.  The hardest part was learning how to do simple integrals and then double and triples were just based off of those.  Now differential equations...that's a tougher class.
Mar 20 2007 10:21AM
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smuggsVT
Posts: 2145 - Karma: 19
uhhhhhhhhhhhhhhhhhhhhhhhhhhh
Mar 20 2007 10:25AM
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mmmmm...Pie
Posts: 673 - Karma: 15
Neither can I, but it's because it's been over a year since I've taken Calc 2. Being advanced in math does squat for you if nowhere in town offers higher than Calc 2.
Mar 20 2007 10:41AM
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Itsbackfliptime
Posts: 18901 - Karma: 75
yeah fuck diff eq. I took that at a community college so I wouldn't die.
Mar 20 2007 11:10AM
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clrumivier4life
Posts: 2429 - Karma: 9
Haha, i took calc 3 at community college.  I wish I would have waited till summer to take diff. eq. there too.  So gay.
Mar 20 2007 11:52AM
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nitsua
Posts: 4631 - Karma: 726
yeah i wish i was better at math
Mar 20 2007 11:59AM
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WONTON
Posts: 6951 - Karma: 55
i fucking raped my calc final yesterdayyyyy
Mar 20 2007 12:51PM
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mad_540_trix
Posts: 2452 - Karma: 14

i got fucking raped by my calc midterm a few weeks ago... 8/45.  i'm taking calc at UBC with no calculus background from high school or college, so yeah, i'm getting owned.

Mar 20 2007 4:53PM
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Forum*
Posts: 3455 - Karma: 10
Intergration substitution with the letter U is way funner....
Mar 20 2007 6:53PM
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user098123
Posts: 6072 - Karma: 18
there is multiple substitutions involved in that problem, its a lot more advanced then regular u substitution
Mar 20 2007 7:24PM
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pns513
Posts: 1966 - Karma: 12
calculus is really stupid, once you get it, it's really easy though
Mar 20 2007 8:03PM
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MistaFab
Posts: 1277 - Karma: 10
hahah thats a clean 17% nice job
Mar 20 2007 8:06PM
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clrumivier4life
Posts: 2429 - Karma: 9
The basics are really easy but once you get to the really advance stuff it makes you want to kill yourself.
Mar 21 2007 11:21AM
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*i<3snow*
Posts: 6440 - Karma: 41
put your roots to powers of -1/2 so you can move it to the top. It makes getting the antiderivative 10x easier. That one looks like a bitch tho. I dont even want to attempt.
Mar 21 2007 3:21PM
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49566738265
Posts: 0 - Karma: 7,704
This stuff isn't so incredible, so stop making it sound amazing that we can do calculus. Thread is useless now that we answered the question.
Mar 21 2007 4:34PM
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Casey
Posts: 7871 - Karma: 24,631
you know a lot of people go to college for 7 years...

yeah, they're called, "doctors"
Mar 21 2007 4:42PM
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mad_540_trix
Posts: 2452 - Karma: 14
haha yes, yes, it is.
Mar 21 2007 7:19PM
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mad_540_trix
Posts: 2452 - Karma: 14
i'll probably only be here for 5 years, including co-op time, and i'll be something called a "geological engineer"....... the average salary of geological engineers in canada is about $122,500.  seriously, i don't care how long it takes to do my degree, i fucking love it here, and i know that before i graduate i'll have a job lined up, and i'll probably be buying a damn nice car as a grad present for myself.
Mar 21 2007 7:22PM
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