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/sci/ - Science & Math

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3398666 No.3398666[DELETED]  [Reply] [Original]

So, I'm trying to prepare for Calc I and I've hit this and I don't understand what's going on.

Sorry for the shitty picture, my phone isn't very good. All the variables are 'u's except for the very first integral.

The area in question is the u^2 that is circled. I don't understand how it became the things underlined.

Any help would be very appreciated.

>> No.3398671

review highschool math

>> No.3398679

>>3398671
Wow, you must be really smart.

>> No.3398685

The basic idea is that you just sub in the un-integrable stuff with a single variable, then at the very end you put it back in when you can integrate it. Hopefully I didn't just state something you already knew.

>> No.3398687

Do it in reverse.

>> No.3398693

>>3398679
unlike OP

this should help
7/5 = 1 + 2/5

>> No.3398696

u^2-4+4=u^2

>> No.3398704
File: 643 B, 156x40, CodeCogsEqn-1.gif [View same] [iqdb] [saucenao] [google]
3398704

>>3398685
I understand that, what I don't get is how my pic happened.
I have to rush through my calc book, so I skip a lot of the trig stuff, so it may have to do with that.

>> No.3398712

>>3398704
No trig in there. Maybe you can work some problems on wolfram alpha. I should stress that you read your chapter fully. Really scrounge every letter to pieces and read it three or four times.

>> No.3398716

they expanded u^2 to u^2-4+4 which still equals u^2

(u^2-4+4)/(u^2-4)=1+4/(u^2-4)

>> No.3398735

>mfw I'm in CC and dropped out of highscholl yet still understand math better then OP

>> No.3398738

If you STILL dont get it,
u^2/u^2-4=(u^2-4+4)/(u^2-4)=(u^2-4)/(u^2-4)+4/(u^2-4)=1+4/(u^2-4)

>> No.3398739
File: 23 KB, 249x251, 1288231557535.jpg [View same] [iqdb] [saucenao] [google]
3398739

>>3398735

>> No.3398741

2011, uses variables for substitution!

Christians 1, Atheists 0

>> No.3398744
File: 275 KB, 379x445, 1299551022831.png [View same] [iqdb] [saucenao] [google]
3398744

>>3398735

>mfw you expect us to care how smart you are

>mfw think that knowing calculus means shit when you're a community college student

>mfw you won't ever need calculus to flip my hamburgers

>> No.3398743

>>3398735
>implying reverse foiling isn't 9th grade kiddie shit

>> No.3398752

>>3398735
>in cc
>impressed he knows math better than someone not in college
I guess that's impressive that you know more than me in a subject when you're in a higher level of education. You should feel very proud of yourself.

>> No.3398760

>implying I took algebra in high school
>implying I didn't drop out with only 3 credits in PE

>> No.3398765

>>3398752

reported for homework and underage

>> No.3398770

>>3398765
You must really be buttmad. Not homework or underage. If you noticed it's actually summer right now(no school, if you also didn't know) and I never mentioned my age, so you must be pretty bad at reading if you think I did.

>> No.3398788

>>3398770

>>I guess that's impressive that you know more than me in a subject when you're in a higher level of education

you implied that your still in high school with this comment

anyways enjoy your ban. it will give you time to study cause you need it

>> No.3398810

>>3398788
>>3398770

Shut the hell up already, both of you idiots.

CC kid, YOU made the mistake of assuming OP must either be in college OR high school. That's a logical fallacy.

Other anon, you allowed cc kid to pull you into this argument instead of ignoring him.

Let's learn from this and move on shall we?

I wish you all had better parents sometimes.

>> No.3398821

sure is samefag in here

>> No.3398826

>>3398821

No it's not. Seriously, just grow up man.

>> No.3398853

It's really not obvious.

Just look at your substitution equalities and play around with em.