2=1

[YZB25]

@pivotman64 no you CAN'T divide by 0. It's something that simply doesn't have an answer. It's not that it's not done because it causes a paradox it's simply that you can't logically do it.

[iObsidian]

@YZB25 Let me tell you why that's bullshit.

You CAN divide by zero. In fact, it's simply "infinity".

0 can go into any number an infinite amount of times.

Dividing by zero is equal to multiplying by infinity.

[YZB25]

@iObsidian Why are you bringing in language? Calm down man. It's the internet.

You CANNOT divide by 0!!!!!! It does equal infinity but infinity doesn't exist!!! When you think about it long enough, you realise infinity can equal ANYTHING as long as you don't count on one more. It can equal 0.00001 as long as I don't think about the number 0.00002! That is why you can't do it! Because it can equal anything you want it to!

If you think infinity is a true number then that means 1 = 2!!!

[CaptainGrizzlyBear]

u have a really disruptive class

[Kaniwano]

I REFUSE TO LEARN OUT FROM SCHOOL!

[hat9458]

blah blah blah 1+1=2 1+1=1.999 2=1 1=2

i hate math -*-

[gTa4ever1369]

why im watching this !!

i hate math

[ThePrimusGuy]

He divided by 15

[Nefariusi]

Diveded by 0 you can´t do that!!!

[freakylocz14]

He divided by zero.

[JackHollTV]

omg are we back to the year 1 of the world? most people knew that 0.99999 was the real numbers not 1,2 but now people have heard of 2 new words! round-up

[JackHollTV]

@JackHollTV :D

[kikomagana1990]

you can't divide by a-b, because a-b would be 0 and as everyone knows, you can't divide by 0.

[dajakesta1234]

hey dude try this a=b a²=b² a²-b²=0 (a+b)(a-b)=0 if a+b=0 a=-b substitute b in a b=-b divide b by both sides 1=-1

[NssOssPtm]

the theory that the mistake is caused by dividing by 0 is wrong. i guess thats what he wanted you to find because it looks like a high school class. but the theory behind dividing by 0 is proven in calculus and it can be done as long as proper restrictions are given. to truly understand this you must know matrices and calculus and then you can see where he went wrong.

[jetforcebomber]

A number divided by 0 approaches infinity. Yay calculus.

[ArtsInfinity]

Did nobody watch the video up to 2:30 or something? The guy ACKNOWLEDGES that there is a mistake. Quit hating on the professor, he knows what he's doing! The only one that doesn't is all you trolls.

[alsoknownasallenkeys]

He said "there's a mistake up here that you're supposed to find" so why does everyone keep saying you're wrong, you're wrong, you're wrong. No he isn't. He said there is a mistake. You would have thought that someone who spots that if a=b then a-b=0 and knows you cannot divide zero by zero would understand that.

[PriestRSC]

Every single one of you guys are WRONG. You cannot divide by zero.

Please graduate algebra 2

[sn8k]

@PriestRSC the whole thing was an extra credit question for the class to see who was paying attention for that week's lesson(s). He even states it at the end that there is a fallacy that needs to be pointed out.

[d0nth3don]

@sn8k hi.. ask ur teacher how to explain this

x+x+x+......(x times)=x^2 (x square)

differentiating both sides

1+1+1+....(x times ) =2x

x=2x

1=2 :)

[NssOssPtm]

@PriestRSC you can divide by 0, please take basic calculus.

[PriestRSC]

@NssOssPtm yeah yeah, I know; h'hopitals rule? Have you read any of the theory analysis that was done on that stuff? Or perhaps have you read (stuff BEFORE L'Hopital's rule was even applied) some of Euclean's works? He proved that by taking limits like that in order to solve for the mystical answer: 0/0 can equal any number of things; defined by the limits you put on it, it destroys the entire basis of what we call math. Take HIGHER calculus before you talk to me.

[PriestRSC]

@NssOssPtm the first one was also meant to be 'L'Hopital's rule'. If you have an email I'll send you one of my cousins disproof of the theory. I understand L'Hopital's rule is a HUGE part of calculus, but there are quite a few problems with it.

[NssOssPtm]

@PriestRSC LOL, you can disprove l'hopitals rule? please send me the link or w/e. i would love to see it. and no l'hopitals rule is not a huge part of calculus, it is just a part that makes solving some problems easier. dividing by 0 does not mean l'hopitals rule, its just one of the many indeterminate forms that can be solved by applying said rule. which does not matter for this question. the only thing wrong with dividing 0 is losing information.

[PriestRSC]

@NssOssPtm yeah I actually can; there's a really good forum on it by Dr. Math actually if you want a more concrete way. But I prove it using certain limits; I'll make a vid tonight and send it to you

[mmiicc0]

@PriestRSC You can divide by zero however the number cannot be defined, therefore creates the fallacy that a = inf or a = -inf.

[PriestRSC]

@mmiicc0 yeah, it's an indeterminate form

[norien123]

@PriestRSC Any number divided by itself is 1, therefor 0/0 is 1.

[DrKillaser]

@norien123 lets say, i have 4 apples.. and il give them to 2 people.. each one will take 2...

5 apples to 10 people..same.. 2 for each one... but when i have 4 apples and i want to give it to no one...how much can i give.... simply infinite number.. but when i have 0 apples and i want to give them to no one... how many apples will i give?... you said 1... o.0...do an experiment and try to give something you don't have to someone doesn't exist

[DrKillaser]

@norien123 also you made kind of paradox here... any number over it self =1.. and zero over any number= 0.... so what is 0/0?.. 1 or 0?

[ivasenko48]

@norien123 ... therefore you are an idiot.

[PiggyKlinsmen]

@PriestRSC You learn that in algebra 2? I learned that when I started dividing...

[pivotman64]

@PriestRSC you can easily divide by zero, it's just not recognized in a real-world application of mathematics

[willghass]

Don't divide by zero. It's more dangerous than russian roultette.

[adildida]

حساب غير صحيح لانه في القسمة على

(a-b)

يجب ان يكون

(a diffèrent de b ) وهدا تناقض

[NeoTifasRevenge]

It's hard to believe I was going to choose math teaching as a career at one point in my life... being a system administrator though does make me wonder if the fallacies in this problem are what makes all my servers get the blue screen of death :)

[aehtenap]

the factoring is wrong. Thats the problem.I don't believe a teacher makes that mistake.

[BACUS666]

''Now, let's see what happens when you replace a with 1.''

/facepalm. You can't just replace a variable with any number you want, in fact, the solution was 0 for both a and b.

[I9824]

@BACUS666 Instead you could substitute a with b, since they are equal. Then you have 2b = b. Divide both sided by b and voila 2 = 1. Now does it make sense?

[BACUS666]

@I9824 Ah, yes, that part makes sense; however, if a=b, then a-b=0, therefore you're not allowed to divide by it .

[ssblord]

If you want the "mistake" the fact that he divided by 0 means nothing unless you add in the fact that in the DPE part of the requirements are that you can't divide by 0

[12connor213]

In the division step he divided by zero. A big no no in math.

[ShadowDreadblade]

Well the mistake is A=B, so A-B=0 for every A and B belonging to R. So you can not divide by zero! That's the mistake. Great teacher.

[niki123489]

"а" is not = to "b"

[HotForStringz]

the (a-b) that you devide with always equals ->0

by deviding the equation with 0, not only you do a synthyx error but you also change the meaning of the equation and making it "impossible"

[afgnaz]

cant divide by zero in division

[Ramzez88]

(a+b)(a-b)= a^2-b^2

3 line is incorrect.

Ur teacher need a big weekand. lol

[nbsec]

My friend, if a+b=b, then a should be nothing but zero. So you can not give a, any positive or negative number other than zero. And the second one is: As you have already stated that a=b, their substraction is zero. Therefore, you can not divide any positive number by zero, unless you want to get an undefined result. Thanks for your video; it really makes students think.

[Adrenaline1717]

he divided by 0 :p

[kevinbollers2]

lol i like this trick

STATE RESTRICTIONS!!!!

[ScottishProfessor]

Smoke and mirrors (sort of like 'conversational logic'). In a base ten system 2=2. Math and science continues its neurotic escape from reality-based concepts. See my video: Displacement Math and Negation Fallacies Parts 1 and 2, very simple and easy to understand foundational concepts.

[Darkrangerofthedeep]

In the very beginning, "a" was squared instead of being multiplied.

[kblade95]

multiplying by itself is the same thing. but either way eventually he divides by 0 which is illegal lol

[markfesenk0]

@Darkrangerofthedeep

a x a = a^2

[Karkenou]

@Darkrangerofthedeep

If you're multiplying both by (a), then:

(a)(a) = (a)(b) =

(a)² = (a)(b)

It's the same thing.

[Pingu123489]

ok sir... so you say this:

a = b

if a = b then a- b = 0

during your part you divide by (a-b) so you divide by 0 which is not allowed during maths :) So sorry your proove is wrong

[hbackslash7]

a-b = 0. it's a div by zero error, but hidden by variables.

[Twentydragon]

If a = b, and u is anything, then

u / (a - b) = u / 0, which is undefined. You can't divide by zero even in variable form.

[honeybbqgrundle]

They don't seem to respect this guy very much.

[sn8k]

believe it or not he was probably one of the most respected teachers at our school. it may have been a little noisy because it was filmed at the last period of the day near the end of the school year with a classroom filled of mostly seniors. he has since retired but like i said one of best teachers our school had to offer.

[abdmalayan]

a+b=b

So, a=0

[joesquills]

I'd be slappin the shit outta those fuckin brats in the back!

"2 doesn't equal one, ...does it?" LOL

[McSmallville]

everybody divided with zero (0)

ITS WRONG

YOU CANT DIVIDE WITH 0

[church7089]

Maybe you can't. I sure can, I can get three answers by dividing with 0. The answers are 1, 0, and undefined. Figure out what I'm doing. ;). Have fun. Lol. It should be pretty obvious.

[prochax]

they are not dividing by 0, they are dividing by 1 and any number divided by 1 is the same number (as far as i know)

[kblade95]

a no his first step was a=b. so if say a=5 then b=5 5-5=0 not one ya dumbass

[yankeesrjr]

1:23

her dad will arrest him! =O

[charleschyip]

N'importe Quoi!

[sanford2008]

chuck norris can divide by zero

[kpoma23]

A QUE COSA LLEGAS CON ESA EXPLICACION

[shahruch]

(a+b)(a-B)=B(a-b)

(2)(0)=1(0)

0=0

[avmist159]

actually, in that, a and b would equal zero, cuz a and b are variables

[shikaguy]

Stop on the section SPE. If a=b, than according to MPE, a^2=ab, and again, since a=b, than ab=aa=a^2. In this case we would have a^2-a^2=a^2-a^2. anything subtracted from itself is zero, so all we get is 0=0.

Same thing in the factor section. Again, if a=b, than we have (a+a)(a-a) = a(a-a). Again, anything subtracted from itself is zero, so a-a=0. We have 0(a+a)=0a, and since anything multiplied by 0 is 0, we have 0=0.

Get your facts straight.

[jados911]

deviding both sides by zero

[typ996]

That was pretty clever.

[thryshade]

2 = 1.

Nothing wrong :o! the two is ok the = is ok and the 1 is ok. lol!

[alexios1994]

wow this is dumb, iv tried the equations, they dont match up; how can you divide zero by zero?

[sn8k]

thats the fallacy. you can't divide by zero. that's the whole point.

[Taygoo15]

@sn8k when did he divide by zero

[pi4estiq]

@alexios1994 so the teacher is a dumbass if he aint know this?

[pivotpcproductions]

@pi4estiq watch the end, he put a mistake on purpose to see if the kid could find it.

[sn8k]

@pivotpcproductions

Finally someone who got it lol! Yest everyone read pivotpcproductions' post here the whole thing was an extra credit question for the class to see who was paying attention for that week's lesson(s). He even states it at the end that there is a fallacy that needs to be pointed out. pivotpcproductions you are my hero and you probably would have passed his class.

[pivotpcproductions]

@sn8k Thank you and you're welcome :D

[sn8k]

@pi4estiq the whole thing was an extra credit question for the class to see who was paying attention for that week's lesson(s). He even states it at the end that there is a fallacy that needs to be pointed out.

[sn8k]

stop giving away the answer! shh! lol

[nicesite]

If a=b then a-b=0. You should not proceed after the step 3 where it says (a+b)(a-b) = b (a-b) as this equation itself is invalid. You cannot divide zero by zero ! Its like saying 25 * 0 = 65 * 0 which is true but it does not mean that you can divide both sides by zero and cancel them off to prove that 25 = 65.

[sn8k]

Aww, you gave it away ha ha ha.

[jdfain]

what is it?

[Yourordinarycrook]

Friggin' awesome. Zikey is the man.

And I know the fallacy.

[sn8k]

shhh don't give it away!