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Old John
Old John
10:00 AM
Hi folks
 
awllower
awllower
Hi
 
Old John
Old John
@awllower Offhand, I can't think of a situation when it would be correct to end a sentence with the words "... for otherwise"
but "... for otherwise ..." in mid-sentence could be possible.
 
awllower
awllower
Oh, it is not an end, but I forgot what follows.
Ok, thanks. Because I am pretty sure that Weil wrote something like this(I even took a picture), but had not enough time to find the assistant and tell him this. Even though he probably woud reject it as well...
 
Old John
Old John
Just a thought: was Weil writing in English, or was it translated by soemone else from a different labguage?
 
BenjaLim
BenjaLim
@OldJohn GLORY GLORY MANUNITED
 
Old John
Old John
10:06 AM
@BenjaLim yep - should be an unassailable lead, but nobody near here is saying anything - in case the same as last season happens :)
 
BenjaLim
BenjaLim
@OldJohn I'm worried about real madrid
Their squad looks a lot more talented than manutd
 
awllower
awllower
The book is "The foundations of algebraic geometry". I suppose this is English originally?
 
Old John
Old John
Yeah - they couold be tough
 
Riem
Riem
vakil's book? or some other one?
 
awllower
awllower
@Riem What do you refer to?
 
Riem
Riem
10:07 AM
oh from a quick wiki you probably mean weil's
 
awllower
awllower
Yes, I mean the book by Weil. Sorry for the misunderstanding caused.
 
Riem
Riem
which is used pretty often in AG courses
 
BenjaLim
BenjaLim
@OldJohn Hmmm not sure how much I will have
 
Novice
Novice
What does one call "algebra" in Anglish (words with pure English originations).
 
awllower
awllower
Nice. Thanks.
 
BenjaLim
BenjaLim
10:09 AM
@OldJohn Maybe it was a bad idea to apply to be the tutor for algebra2....
 
Old John
Old John
@BenjaLim I have found that teaching people something is a perfect way to see if I really understand it fully myself :)
I think it could be an excellent thing for you to do
 
BenjaLim
BenjaLim
@OldJohn I agree completely. I often find myself fumbling to explain a certain concept I thought I understood :D
@OldJohn The thing is I have this AG this happening. Plus classes in measure theory and DG
 
awllower
awllower
Ι ψ·ννοτ ·γεε όρε
 
BenjaLim
BenjaLim
@OldJohn I will come to you for measure theory!
 
awllower
awllower
Wrong type mode...
I cannot agree more.
 
BenjaLim
BenjaLim
10:11 AM
@OldJohn Maybe I was not as pro as when I took the class in computing Galois groups
but I certainly have more experience now.
 
Old John
Old John
@BenjaLim you are going to be busy"
 
awllower
awllower
What does DG stand for? Dihedral groups?
 
BenjaLim
BenjaLim
@OldJohn Probably.
@awllower Differential geometry.
 
awllower
awllower
Oh, thanks.
 
Old John
Old John
@BenjaLim I can still remember some (but not all) the measure theory I used to know :)
 
awllower
awllower
10:12 AM
So you are going to have a course on DG?
Is it going to end with Gauss-Bonnet? Or somewhere else?
 
BenjaLim
BenjaLim
@OldJohn I THOUGHT YOU WERE AN ANALYSIS GOD???????????????? :D :D :D :D
2
@awllower Hahahaha I don't even know apparently it's very hectic and ends with Riemannian geometry
 
Old John
Old John
@BenjaLim Good grief NO - whatever gave anyone that impression????
 
awllower
awllower
Very interesting then.
 
BenjaLim
BenjaLim
@OldJohn I thought you mainly concentrated on analysis :D
 
Old John
Old John
@BenjaLim yeah - dabbled is about right :)
 
BenjaLim
BenjaLim
10:14 AM
@OldJohn The word "dabbled" has negative connotations.
 
Old John
Old John
@BenjaLim narh - I have dabbled in lots of things throughout my life - never really mastered anything, but certainly enjoyed my dabbling :)
 
BenjaLim
BenjaLim
@OldJohn I remember reading the first few pages of Stein and Shakarchi. I was not impressed with the results of measure theory
 
Old John
Old John
@BenjaLim I found measure theory to be a useful tool for getting to other results, rather than a subject I wanted to study for its own sake
Hmm - this guy seems to be asking question which get no votes, no answers, no comments - he could be a "tumbleweed expert"
 
awllower
awllower
Hmm. It reminds me of one saying of Grothdieck:
I have been reading Chevalley's new book on class-field theory; I am not really doing research, just trying to cultivate myself. 1956
 
Old John
Old John
Must go - time for the gym - later folks
 
awllower
awllower
10:26 AM
L8er
 
BenjaLim
BenjaLim
10:47 AM
@OldJohn have a good workout.
 
awllower
awllower
11:33 AM
to have dinner now, later everyone.
 
Julian Kuelshammer
Julian Kuelshammer
11:53 AM
quite a lot of maintenance these days
 
Chris's sister
Chris's sister
Hi all
Long time I didn't enter here. :)
 
Theorem
Theorem
Hi @Chris'ssister
 
Chris's sister
Chris's sister
@Theorem: hi
 
Theorem
Theorem
Chris and chris's sister , are u both the same @Chris'ssister
i used to know someone called Chris
 
Chris's sister
Chris's sister
Actually, there are 3 persons under this username (I (sister) + Chris + Chris's friend)
 
Theorem
Theorem
12:07 PM
oh
quite complicated :P
 
Chris's sister
Chris's sister
Yeah, as the life is. :D
 
Theorem
Theorem
well said
 
Chris's sister
Chris's sister
@Theorem: I just updated the username.
 
Theorem
Theorem
oh great :D
 
Chris's sister
Chris's sister
@Theorem: @Chris's sister and pals
:D
 
Theorem
Theorem
12:14 PM
so u and many of ur friends use the same account
 
Chris's sister
Chris's sister
@Theorem:well, just sometimes.
 
Theorem
Theorem
are u an undergrad student ?
and where ?
@Chris'ssister
 
user19161
3 more days to Valentine's Day.
 
Theorem
Theorem
@JacobBlack : mathematicians do not celebrate V - Day
 
user19161
@Theorem Haha, really? Then they are not true mathematicians.
 
Theorem
Theorem
12:20 PM
@JacobBlack : i don't know . we need to ask some great mathematicians
 
user19161
@Theorem Such as Theorem.
 
Chris's sister
Chris's sister
@Theorem: I'm in the penultimate year in high school and my borther is a prospective accountant.
 
Theorem
Theorem
@JacobBlack : ya i think i won't .
 
user19161
@Chris'ssister Are you going to study math in uni?
 
Theorem
Theorem
@Chris'ssister : good . i like ur questions .
 
user19161
12:22 PM
By the way, can one reverse engineer the email from the default gravatar?
 
user19161
Not that I am stalking anyone.
 
Chris's sister
Chris's sister
@Chris'ssister: I don't know. I and my bro have never liked the school. :-) We prefer a different way to learn things.
 
user19161
@Theorem You should watch the movie Valentine's Day.
 
Jonas Teuwen
Jonas Teuwen
@JacobBlack Doesn't seem like it.
 
user19161
@JonasTeuwen Bro, you need to use the right arrow so people know what you are replying to.
 
user19161
12:25 PM
@Chris'ssister Yeah, classes were mostly a waste of time for me. I learn everything I know by myself.
 
user19161
@Chris'ssister Did you just ping yourself?
 
user19161
The number of this room is 36, a perfect square, very good.
 
Chris's sister
Chris's sister
@JacobBlack: no. Just a mistyping.
 
Theorem
Theorem
@JacobBlack : no time for love movies .
 
Jonas Teuwen
Jonas Teuwen
@JacobBlack Jonas doesn't use arrows.
 
Theorem
Theorem
12:31 PM
individual.utoronto.ca/sck/vday.html people have a look at this
 
Chris's sister
Chris's sister
Let the real number sequences $(x_{n})_{n\ge1}$, $(y_{n})_{n\ge1}$ that both converge to $0$. Compute $\lim_{n\to\infty}\frac{x_n^2y_n}{3x_n^2-2x_ny_n+y_n^2}$
What would you do here? (it's from a local math contest)
 
Theorem
Theorem
@Chris'ssister : let $y_n/ x_n =z$
or something appropriate
 
Chris's sister
Chris's sister
@Theorem: yeah. This should work.
 
user58512
user58512
@Chris'ssister, do yo know complexanalysis (not related to your question)
 
Chris's sister
Chris's sister
@user58512: my bro only.
 
user58512
user58512
12:53 PM
I don't know complex analysis properly :(
 
Theorem
Theorem
@user58512 : have u done a course on comp analysis ?
 
user58512
user58512
yes
 
Theorem
Theorem
how many ?
 
user58512
user58512
one
 
Theorem
Theorem
when are u doing next ??
 
user58512
user58512
12:55 PM
?
 
Theorem
Theorem
i will be doing comp analysis 2 , but haven't done comp analysis 1 .
i am quite worried if i can catch up without doing comp ana 1 .
 
user19161
@Theorem Why are you doing 2 without 1?
 
Theorem
Theorem
because i don't have time to take 1 .
 
user19161
Then why do you have time to take 2?
 
Theorem
Theorem
@JacobBlack : if i do comp ana 2 then i think i will know what 1 has to give me .
:D
 
user19161
1:06 PM
@Theorem Wrong.
 
Theorem
Theorem
@JacobBlack : why do u think so ?
 
user19161
Then you might as well not take anything and just read on your own.
 
Chris's sister and pals
Chris's sister and pals
:)
 
Theorem
Theorem
but i do need credit also @JacobBlack :(
u know what i mean @JacobBlack
 
user19161
@Theorem The college allows you to take 2 without 1? That is very weird.
 
user19161
1:08 PM
What is the world coming to?
 
Theorem
Theorem
@JacobBlack : german system is like that .
 
user19161
@Theorem You transferred there?
 
Theorem
Theorem
@JacobBlack : in german system u can do whatever u want , but u need to have certain number of credits .
what do u mean ? @theorem ?
oops @JacobBlack
 
user19161
I thought you switch uni halfway.
 
Theorem
Theorem
no not really
 
user19161
1:10 PM
OK. Well, still strange system to me.
 
user19161
Then again, the Cambridge system is strange too.
 
user19161
Some courses have 24 lectures, some 12, some 16.
 
user19161
Exams mix up all topics and are on paper 1, 2,3.
 
Theorem
Theorem
u are in cambridge ?
@JacobBlack
 
user19161
I am not, I just happen to know.
 
Theorem
Theorem
1:12 PM
then where ? @JacobBlack
 
user19161
@Theorem Well, I finished undergrad long ago. I am not in school now.
 
user19161
That is a secret.
 
Theorem
Theorem
oh , @JacobBlack sorry . thats good . :)
are u doing phd ?
 
user19161
@Theorem Oh, I am not in any school now, if that is what you mean. No, not doing any course now.
 
Theorem
Theorem
what plans then
@JacobBlack
 
user19161
1:18 PM
@Theorem I may apply to grad school in future, I don't know.
 
Theorem
Theorem
ok see ya
bye
get to start slogging
 
user58512
user58512
I guess I shouldn't do math becauseim not really smart
 
user19161
@user58512 Well, no need to be a genius, as long as you have some ability, you can try to do it.
 
user19161
1:39 PM
@user58512 You just need some talent and lots of hard work.
2
 
user58512
user58512
i just feel bad because i feel like I am failing
 
user19161
You have to decide for yourself if you want to carry on.
 
user19161
You can listen to others' opinions, but at the end, make your own decision.
 
user58512
user58512
I have to try my best to the end because I already wasted so much of my parents money to come here
 
user19161
OK, hang in there. There can be miracles when you believe.
 
user58512
user58512
2:02 PM
if I pretend I have a chance to pass I can stay working
 
Novice
Novice
@JacobBlack None here. I have a feeling that something bad is about to happen to me.
 
user19161
@Novice Like what? Are you sick?
 
Novice
Novice
@JacobBlack Yes, I am sick in its colloquial sense, but in the literal sense I'm okay.
 
awllower
awllower
I am always sick compard with such masters A.Weil: He must say: what? You must be sick so that you cannot understand CFT well. What? You must be severely sick that you cannot even understand my "basic number theory"...
such masters as A.Weil
 
user58512
user58512
"basic number theory" lol
 
awllower
awllower
2:11 PM
Haha
 
user58512
user58512
why did he call it that?
 
awllower
awllower
Because he referred to it as very easy indeed...
 
user58512
user58512
another good one is Serre "A course in arithmetic"
sounds easy..
 
user19161
Yeah 1+1=2.
 
awllower
awllower
Hmm, he once said, in a preface to his Russian edition of BNT: the role of CFT is as essential as Galois theory
And indeed every mathematician ought to know the two very well...
He said, not me...
 
user19161
2:14 PM
CFT is just FTC permuted, hahaha.
 
user58512
user58512
@awllower, I study zeta functions and it is very difficult - I think I have to drop my class :(
 
Novice
Novice
@skullpatrol @Charlie listen to this
 
awllower
awllower
What is FTC? Federal Trade Commision?
 
user19161
@awllower Try again.
 
awllower
awllower
first Technology Challenge??
 
Novice
Novice
2:15 PM
@JacobBlack What do you think about the Mustafa store?
 
awllower
awllower
Oh, it must be Fundamental Theorem of Calsulus.
 
user19161
Yes.
 
awllower
awllower
Thanks.
 
user19161
@Novice Well, almost nobody goes there except Indians. I go there though.
 
awllower
awllower
@user58512 What have you learned about zêta-functions now?
 
Novice
Novice
2:17 PM
@JacobBlack Yes, I have seen that the store is overcrowded with Indians. But the store is nice.
 
user58512
user58512
@awllower, counting zeros, zero free region and seigel zeros and the formula psi in terms of zeros
 
user19161
@Novice I actually get a little scared when I go there, because I am the only Chinese walking around.
 
awllower
awllower
I think that, except for genius, one must think of mathematics as very hard, otherwise it could not be so interesting. But, there are very many mathematicians aside from genius of course.
 
user58512
user58512
and how much do I understand: zero. Just kidding
 
awllower
awllower
Haha
 
Novice
Novice
2:18 PM
@JacobBlack Where do the Chinese usually go?
 
user19161
@Novice Everywhere.
 
Novice
Novice
@JacobBlack OK. Have you been to the Sky Park?
 
user19161
@Novice Which one? I am not sure how many there are...
 
awllower
awllower
Hmm, it looks like that I know even less than zero.
 
user19161
@user58512 Have you studied Rieman Mapping Theorem?
 
awllower
awllower
2:20 PM
My knowledge is negative.(crying)
 
Novice
Novice
@JacobBlack Well, the one on the top of Marina Bay Sands.
 
user58512
user58512
@awllower, did you not study such things? like prime number theorem - I assume you knew these even though it's not algebraic
 
user19161
@Novice Ah, you mean at the top of the hotel itself?
 
user58512
user58512
@JacobBlack, I think so when I studied fractals I learned this
 
awllower
awllower
Yes I knew them--my high school library has nothing else in the field of number-theory.
 
Novice
Novice
2:21 PM
@JacobBlack Yes.
The ship.
 
user19161
@Novice Yes, nothing special.
 
awllower
awllower
I was once determined to do analytic number theory, at least when I went into the college.
 
Novice
Novice
@JacobBlack Mhm, the meal was a little out of my reach.
 
awllower
awllower
But, one day, when I was readong some books on the subject, I thought to myself: where is the number-theory at all?
 
user58512
user58512
hehe
I know what you mean
 
awllower
awllower
2:22 PM
And I saw none, so I turned instead to algebraic number theory thus...
I saw nothing but functions, zeroes, and some similar stuff.
Oh, I have to mention that the knowledge of some analytic number theory does meke me more familiar with the proof of Eisenstein of quadratic reciprocity law.
What a shame I did not know Eisenstein...
 
user58512
user58512
Eisenstein is amazing
 
awllower
awllower
Indeed: I still wonder how one accomplishes so many calculations at all.
 
user58512
user58512
where did you read his proof?
oh, you know french
 
awllower
awllower
Let me recall
 
user58512
user58512
I need english
so nevermind
 
awllower
awllower
2:26 PM
This book contains many proofs, and is in English
 
user58512
user58512
oh! thanks
 
awllower
awllower
By the way, where can I find French articles of Eisenstein?
It would be most apprepriated if I can get my hands on it.
appreciated
 
user58512
user58512
yes you can
 
awllower
awllower
Thanks very much!!
BTW, I have a slight question: How can one put some pictures on the internet, and give it an ID?
 
user58512
user58512
i dont know what you mean
a URL?
 
awllower
awllower
2:33 PM
yes
 
user58512
user58512
you can use imgur.com
 
awllower
awllower
Hmm, let me try.
 
user58512
user58512
you don't need an account
just find "Upload images"
 
awllower
awllower
Is this working?
http://imgur.com/KYP3xOe
 
user58512
user58512
yes
 
awllower
awllower
2:36 PM
Oh this is better
http://i.imgur.com/KYP3xOe.png?1
 
user58512
user58512
 
awllower
awllower
Thanks.^^
A little busy now: If one wants to call me, please mark, to remind me of it. Thanks.
 
user58512
user58512
bye
 
Charlie
Charlie
@skull there?
 
Charlie
Charlie
2:55 PM
@Novice interesting
 
Charlie
Charlie
3:22 PM
@michael how are you?
 
Michael Corleone
Michael Corleone
@Charlie good, and you?
 
Charlie
Charlie
@MichaelCorleone good too
 
Michael Corleone
Michael Corleone
good :)
 
Charlie
Charlie
:)
 
Nimza
Nimza
3:50 PM
Hello, help me please, is it possible to represent integral $$ \int\limits_{ \frac{x_1^2}{a^2}+\frac{x_2^2}{b^2}=1} e^{i \xi x} dS(x) $$ via some well-known functions?
 
Charlie
Charlie
4:19 PM
@Nimza Post on main, Leshe4ka, maybe you get some answers...
 
Nimza
Nimza
@Charlie hehe, thank you Ma, I've found a way via coarea formula :)
 
Charlie
Charlie
@Nimza Great!
 
user58512
user58512
4:54 PM
good day anon
 
Charlie
Charlie
 
Henning Makholm
Henning Makholm
5:10 PM
I think someone is trying to insult me by calling me an "EKSI", but what on earth is that? Google is no help; Urban Dictionary suggests it is a Tamil expletive...
 
Charlie
Charlie
@HenningMakholm weird...
 
Old John
Old John
Yo
 
Charlie
Charlie
hey, John!
 
Old John
Old John
@HenningMakholm Pretty feeble way to insult someone - use a term that nobody understands!
I reckon I could insult people more effectively :)
Hi @Charlie
 
Charlie
Charlie
@OldJohn How are you?
 
Old John
Old John
5:17 PM
Fine thanks - tired of the weather, and looking forward to next holiday :)
How are things with you?
 
Charlie
Charlie
@OldJohn Good, the day is sunny, it's holiday here, I'm making a Kawasaki rose :)
 
Henning Makholm
Henning Makholm
@OldJohn There's the benefit that it's hard for me to defend myself by arguing that I'm not one.
 
Old John
Old John
@Charlie origami?
 
Charlie
Charlie
@OldJohn yes
 
Old John
Old John
@HenningMakholm Quite true
 
Orange Harvester
Orange Harvester
5:19 PM
@HenningMakholm It is a way to express being surprised. Like, "Why the heat, mate? ;-)" Not really an insult, more of an appreciation of your sarcasm.
 
Old John
Old John
@Charlie I used to be black belt in origami - not done any for many years
 
Charlie
Charlie
@OldJohn I love it!!!
 
Orange Harvester
Orange Harvester
Ahh, the hallowed corridors of good motor skills.
 
Old John
Old John
@Charlie A few years ago we had a wedding anniversary with paper being the "theme" - my wife and I both bought each other origami books - totally independently :)
 
Charlie
Charlie
@OldJohn Cool!
 
Orange Harvester
Orange Harvester
5:25 PM
@Charlie ...
 
Charlie
Charlie
@OrangeHarvester what?
 
Orange Harvester
Orange Harvester
@Charlie nothing..
 
Charlie
Charlie
this is what I enjoyed the most
 
Orange Harvester
Orange Harvester
@Charlie cool
 
Charlie
Charlie
@OrangeHarvester and it's really nice to do!
 
Old John
Old John
5:29 PM
@Charlie I once did something like this - but my favourite used to be a parrot that I can't find an image for
 
Charlie
Charlie
@OldJohn nice! I need proper paper, otherwise it becomes hard to fold and give the effect or you can rip the paper
 
Orange Harvester
Orange Harvester
@OldJohn Do people first draw the folds and then fold it, or do they start from the middle and then move on to details little by little?
 
Old John
Old John
@Charlie Yep - I bought my wife some special paper too
 
Charlie
Charlie
@OldJohn that's awesome!
 
Old John
Old John
@OrangeHarvester I'm not sure either of those describe the process :)
I certainly never drew any folds first
mostly just followed examples other people had discovered
 
Orange Harvester
Orange Harvester
5:33 PM
@OldJohn Hahaha. I must read about it then.... The closest I could come to origami was making paper boats (if that is allowed), even that was not very successful, I would regularly tear everything. Right now, I have settled on making planes and then introducing various tweaks to influence their flight.
 
Charlie
Charlie
@OrangeHarvester Start here
 
Old John
Old John
@OrangeHarvester Yeah - there is a lot of skill in making a paper plane that flies well
 
Charlie
Charlie
Did you guys see that Pope resigned?
 
Jordan
Jordan
I am ultra bad at math, how do I do $x^2 + 3x - 5x -15(x-2)$
I wrote that wrong
 
user58512
user58512
@Jordan, what do you want to do to it?
 
Jordan
Jordan
5:47 PM
I think is should all have parentheses
find a poly given the roots
 
user58512
user58512
if roots are a,b,c then k(x-a)(x-b)(x-c) has those roots
 
Jordan
Jordan
so for example (x-5)(x+3)(x-2)
I am such an idiot, this is like third grade math
I mean I foil the first set
so is it then $(x^3 + 3x - 5x - 15)(x-2)$?
I know that is a wrong answer
 
user58512
user58512
what are you trying to do
 
Jordan
Jordan
find a poly given the roots
 
user58512
user58512
what roots
 
Jordan
Jordan
5:50 PM
5, -3 and 2
 
user58512
user58512
ok
 
Jordan
Jordan
but I am a fucking idiot and I can't multiply
 
user58512
user58512
k(x-5)(x--3)(x-2) is one for any nonzero k
you can multiply just do it one step at a time
 
Jordan
Jordan
I get $(x^2 - 3x-5x-15)(x-2)$
 
user58512
user58512
(x-5)(x+3) = x(x+3)-5(x+3) = x^2+3x-5(x+3) = x^2+3x-5x-15 = x^2-2x-15
 
Orange Harvester
Orange Harvester
5:52 PM
@Charlie Just read an article about it now. I did not know it was such a big deal. I mean an Italian MP is commenting on it!!! Holy smoke. Italian MP, German Chancellor etc ! Now even David Cameron!
 
user58512
user58512
(x-5)(x+3)(x-2) = (x^2-2x-15)(x-2) = (x^2-2x-15)x-(x^2-2x-15)2 = x^3-2x^2-15x - 2x^2-4x-30 = x^3 - 4x^2 -19x - 30
 
user19161
Is it the same @jordan I talked to?
 
Jordan
Jordan
possibly
 
Charlie
Charlie
@OrangeHarvester yes, it is!
 
user19161
Your avatar changed @jordan.
 
Jordan
Jordan
5:53 PM
Not sure why
 
user58512
user58512
@Jordan, see how I did it
 
Jordan
Jordan
no
 
user58512
user58512
what is the first step you don't understand
 
user19161
@user58512 If you are short of time, I also suggest you spend less time on the internet, that will help you focus.
 
Jordan
Jordan
you pulled out an x-2?
 
user58512
user58512
5:54 PM
what does that even mean
 
Jordan
Jordan
(x^2-2x-15)x-(x^2-2x-15)2
I don't know where those numbers came from
 
user19161
He is just expanding to show that the factorising holds.
 
user58512
user58512
do you know that k(x-2) = kx-k2?
 
Jordan
Jordan
no
 
user58512
user58512
or
A(B+C) = AB+AC
how about this
 
Jordan
Jordan
5:55 PM
yeah
 
user58512
user58512
that's what I did
 
Jordan
Jordan
but that isnt anywhere in the problem, everything is 2 terms together
 
user58512
user58512
what
 
Jordan
Jordan
things like (x-2)(x+3) instead of A(4-x)
 
user58512
user58512
(x^2-2x-15)(x-2) = (x^2-2x-15)x-(x^2-2x-15)2
is using A(B-C) = AB-AC
 
Jordan
Jordan
5:58 PM
I have trouble seeing that
 
user58512
user58512
A = x^2-2x-15
B = x, C = 2
 
Jordan
Jordan
to me is should look like (x-2)(x^2) - (x-2)(2x) -15(x-2)
 
user58512
user58512
write out A(B-C) = AB-AC
replacing A,B,C with A = x^2-2x-15, B = x, C = 2
 
Jordan
Jordan
I am not seeing why you split the x - 2 like that
or what that is valid
 
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