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/sci/ - Science & Math

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4114176 No.4114176 [Reply] [Original]

Challenge #2

Truth is; I'm a math techer and I want YOU guys to refresh your own minds. This might be simple for some of you guys, but I still doubt that every self-claimed mathfag knows how to solve this.

Again, no cheating. I got the answer + right calculations. Who will be the fastest to solve it?

Inb4 Douchebags telling me this is homework - that's just plain stupid.

>> No.4114177

lol thinly veiled homework thread

>> No.4114178

I am not doing your fucking high school integrals homework. gtfo.

Also reported.

>> No.4114179

stop posting your homework

and the fact that you're trying to validate your intelligence on an anonymous board is proof that you're insure and shallow.

>> No.4114184

>>4114177
If this really was homework, why would I ever spend so much time setting this up, instead of just looking it up in a damn mathematics book? You can learn this type of math in a matter of minutes on the internet too. Please, use your brain.

>> No.4114189

>>4114184
Prove it by solving a similar problem.

>> No.4114190

>>4114178
Reported for keeping this board alive? If you don't want to play, feel free to leave. I wont reply on any more of these rage comments.

>> No.4114193

>>4114184
maybe it isn't homework, but its still trivial shit that attracts high schoolers and should be purged.

>> No.4114198

>>4114189
I do that every day, sir. But that would create a template on How-To do the problem, which would destroy my challegne completely.

Let the game begin!

>> No.4114203
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4114203

This thread is now about this problem.

>> No.4114207

It's a fucking bounded integral how is this hard?

>> No.4114208

>>4114198
But the solution to this problem is exactly the same as the last one you posted, so that's essentially the template.

Don't tell me you can't integrate <span class="math">e^x[/spoiler]. lol, what Calculus book are they using at your community college?

>> No.4114211

they see me rollin, they hatin
4.5+e*(e-1)
did I fail?

>> No.4114212
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4114212

lol, honestly forgot howto solve these kind of problems. really, i would appreciate some calculations too..

>> No.4114220

>>4114208
We're using a book called Gyldendals Gymnasiematematik B2 (Gyldendal's Collegemath B2) - I'm from Denmark.

American students are much smarter than mine... That's so frustrating.

>> No.4114218

>>4114212
You forgot your trip, OP.

>> No.4114222

>>4114218
>>4114220
This isn't me, lol.

>> No.4114227

>>4114211
You almost got it. Show me your calculations.

>> No.4114229

>>4114220 I'm from Denmark.

I'm sorry to hear that.

>> No.4114230

>>4114227
gtfo seriously

>> No.4114238

>math techer

>> No.4114239

>>4114227
lol high school fag

>> No.4114240
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4114240

oh jojojo!!!

>I challenge /sci/
>Is just for fun.
>not my homework

Dude... honestly... I expected more from this shit.

>> No.4114243

me again

this is just as simple as the last one. same method.

<span class="math">\int^2_1(e^x+x+3)dx=(e^x+x^2/2+3x|^2_1=
=e^2+10-e-1/2-3=e^2+e+13/2[/spoiler]

>> No.4114249

>>4114243
Congratulations, you proved to /sci/ that you're idiot by trying to prove that you're smart.

>> No.4114252

>>4114243

also, there's an intentional mistake, op. Hope you can find it before you use it in your homework.

>> No.4114250

>>4114243
wtf are you doing. You are the reason /sci/ sucks so much. gtfo.

>> No.4114251

>mfw basic integration
e^2 + e + 6.5

>> No.4114254

>>4114243
>(2^2)/2 + 3*2 = 10

>> No.4114256

Winner. Good job :)

>> No.4114259

>>4114250
>>4114249

cry about it

>> No.4114262

>>4114256
>Good job
>Wrong result
you know OP, you could have asked wolframalpha to do your homework anyway

>> No.4114266

>>4114243
thanks man, i needed that refreshed

>> No.4114267

>>4114243
>>4114243
>>4114243
>>4114243

WHAT THE FUCK!! MAAAAN!! WHAT 'CHA DOING!!!

That why we keep getting this fucking posts.. because people like you still answering the idiots.

>intentional mistake
he would probably copy it and then get less points.. but still getting away with it.

>> No.4114269

>>4114256
His answer is incorrect. You obviously don't know the answer yourself, lol.

>> No.4114272 [DELETED] 

>>4114256

are you retarded?

i'm the one giving you the answers and I know this is a poorly disguised homework thread.

Just ask for an explanation of how to do basic integrals. . . . lots of people here like to discuss math, so try that instead.

>> No.4114274

>>4114262
Well. I didn't want to mention that he was VERY close. He did a good job and forgot to put a - instead of a +. He was the only one trying at least. Let's see your own calculations if you're that good then. Instead of using WolframAlpha.

The results is e^2 - e + 4,5

>> No.4114281

>>4114274
>forgot to put a - instead of a +
Nope.

Finals week is coming up. Shouldn't you know this stuff by now?

>> No.4114282

>>4114274
my previous posts here were
>>4114211
(which is the correct result according to you, lol)
and
>>4114239
because why else would you like to see my calculations. Not that this isn't pretty much exactly the same problem from the previous thread anyway

>> No.4114287

>>4114176
any more OP? these problems are a good challenge...

>> No.4114290

>>4114287
Hi OP

>> No.4114293

Does this involve hilbert spaces?

>> No.4114294

>>4114287
if you're into programming (python is piss easy), you should try Project Euler, those problems actually make you think

>> No.4114302

>>4114290
haha, im not OP. Nice try though

>> No.4114309

>>4114287
oh man... 15 years old.. are getting dumper..

>> No.4114326
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4114326

>>4114293

u kno the answer to that; assume the R^n space with a calc I problem lol

>> No.4114331
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4114331

>>4114309

for you it's happening by the second, it seems.

>> No.4114328

>>4114309
>dumper

>> No.4114332

>>4114287
I could come up with some more, but people seems to hate it.

Sorry guys, I'm actually trying to get /sci/ going. I'm not into all that space shit and such, I just like the math aspect of this board.

>> No.4114334

Bahaha your a techer? I believe that student is going to correct the TEACHER at this time :l shame, what is the world coming to when our higher educators can't even spell...

>> No.4114342
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4114342

>>4114332

I admire your efforts sir; let's just get people from physicsforums and 7chan to come here instead since there's a bigger population base pre-existent

>> No.4114344

>>4114334
That wasn't me posting there. I'm no damn teacher, just an 19 year old dude who likes math.

>> No.4114348

>>4114332
you could try making a list of very unrelated problems, and harder than high school shit. I mean, just integrating and evaluating is pretty lame.
btw I'm >>4114282
It would be awesome to discuss some math problems but honestly this one looks way too much like high school homework.

>> No.4114351
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4114351

Integral from 1 to 2 of x+e^x + 3
.5X^2 + e^x +3x
2 + e^2 + 6
15.4
.5 +e+3
15.4 - 6.21
9.19 units

>> No.4114356

>>4114344
math is fine, it just has to not be basic calc (or god forbid anything easier)
even .999 = 1 threads give better discussions on real math

>> No.4114358

<div class="math">\int_{x=1}^{x=2}\int_{y=0}^{y=x+e^x+3}dydx</div>
<div class="math">=\int_{x=1}^{x=2}\left.y\right|_{y=0}^{y=x+e^x+3}dx</div>
<div class="math">=\int_{x=1}^{x=2}x+e^x+3dx</div>
<div class="math">=\left.\frac{x^2}{2}+e^x+3x\right|_{x=1}^{x=2}</div>

>> No.4114368

>>4114358
Fucking quit that shit. Double and triple integrals doesn't make you look smart. Knowing when not to use them does.

>> No.4114370

>>4114368

much agreed

>> No.4114372

>>4114332
dont worry about those faggots, post science and math to make this board what it should be, not faggots dragging this board to shit

>> No.4114376

the fuck? This is just a basic integral...

>> No.4114380

>>4114368
im not trying to look smart, i was serious when i said that is how i see the solution.
besides, fuck you for making me reply

>> No.4114383
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4114383

Keep raging guys.

If you want to play, go for it :-)
This is the last - and hardest!

>> No.4114381

r u a techer?

>> No.4114392

>>4114372
Thank you. I appreciate that at least SOMEONE is using their head in here.

>> No.4114397

>>4114383
this is a whole new level of troll

>> No.4114408

>>4114397
No. You're simply just wasting your time, sir.

Go teach people about scientology or something, that fits your brainactivity perfect.

>> No.4114411

>>4114383
20?
integral= (x^4)/4 - x^2 + 5*x

>> No.4114418

>>4114383
20

>> No.4114417

>>4114383
<div class="math">\int_{x=-2}^{x=2}\int_{y=0}^{y=x^3-2x+5}dydx</div>
<div class="math">=\int_{x=-2}^{x=2}\left.y\right|_{y=0}^{y=x^3-2x+5}dx</div>
<div class="math">=\int_{x=-2}^{x=2}x^3-2x+5dx</div>
<div class="math">=\left.\frac{x^4}{4}-x^2+5x\right|_{x=-2}^{x=2}</div>

>> No.4114415

>>4114408
i've taken a dozen math courses since this high school level shit.

>> No.4114420

>>4114411
Good job! That was pretty fast. Though a lot of the calculations are missing.

The result is 20.

>> No.4114422
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4114422

TIME TO CRANK IT UP A NOTCH

CALCULATE THE AREA OF THE SUBSSET OF THE COMPLEX PLANE GIVEN BY
<div class="math">\quad z_{k+1}=z_k^2+\mu~;\quad z_0=0</div><div class="math">\quad M=\{\mu\in\mathbb C~|~z_k~\mathrm{bounded~for~all}~k\}</div>

PIC UNRELATED (BUT PRETTY GOOD APPROXIMATION)

>> No.4114430
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4114430

how bout this one mr. math teacher?

>> No.4114438

>>4114422
1.50659177

>> No.4114442

>>4114422
I'd say 7+/-3

>> No.4114446

>>4114442
Ah, shit, forgot to divide by 4;
So, 1.5+/-0.5

>> No.4114447

>>4114438
THAT WOULD BE THE ANSWER TO "FIND AN APPROXIMATE RATIONAL ESTIMATION"
>>4114442
THIS ISN'T ASTRONOMY SON

>> No.4114454

>>4114447
What does it have to do with astronomy?
And what's up with the CapsLock, by the way? Did you get a lobotomy, or something?

>> No.4114464

>>4114430
Well, I'll try.

Int(0,1) (ln(x +1) / (x^2 + 1))dx = 1/8 * pi * log(2)

= 0.27 ?

>> No.4114462

>>4114447
woah woah woah
If you're going to go off like that, I sure hope you can prove that the area ISN'T rational

>> No.4114472

>>4114464
*Slow clap*
http://www.wolframalpha.com/input/?i=Int%280%2C1%29+%28ln%28x+%2B1%29+%2F+%28x^2+%2B+1%29%29dx

>> No.4114478

>>4114472
I did mine at my paper, lol. I guess that proves I'm right, doesn't it?

>> No.4114502

>>4114430
Meh, off by a factor 1/2. Forgot the branch cut of the logarithm along the negative axis. Oh well.

>> No.4114505

This is easy no?

Assuminng the curved line is y=h(x)

Intergrating between the boundaries 2 and 1 of x+e^x+3 dx,
letting int(h(x))=H(x)=0.5x^2+e^x+c H(2)-H(1)=2+e^2-(0.5+e)=1.5+e^2+e
Approximatly equal to 11.6073379.

>> No.4114513

>>4114502
>mfw I just realized you aren't good at math - you just know a lot of cool stuff having to do with math

The King has been dethroned.

>> No.4114514

>>4114447
I feel like your that crazy shark guy who tried to teach spongebob to drive a car when mrs. puff failed

>> No.4114515

>>4114464
Show your work, Mr. Math Techer

>> No.4114535

>>4114515
MUHUHAHA agreed

>> No.4114546

>>4114535
well it's actually a hard problem so I don't blame him for not knowing it. That is a question from the Putnam and those solutions take pages you evil bastard

>> No.4114551

What would plugging in X = 2 to the function and subtracting X = 1 plugged into the function get me? The length of the curve from x = 1 to x = 2?