/sci/ - Science & Math » Thread #12817746

>>12817810
>>12817824
>>12817846
That guy is wrong, it's not really cancelling. It's like when you have two sides of a scale, and one side has a 1 pound brick and a 1 ounce brick, and the other side has a 1 pound brick and a half ounce brick. The 1 pound bricks are on both sides but you don't really count them. They don't "cancel out" but more like equalize because they are still there.

Anonymous

Anonymous Thu 11 Mar 2021 04:37:06 No.12817858 Report

Quoted By: >>12817869

>>12817835
Are you talking to yourself? How do you think the equation is being "cancelled out"? By division, perhaps?

Anonymous

Anonymous Thu 11 Mar 2021 04:38:07 No.12817864 Report

Quoted By:

>>12817856
>Imagine being this retarded

Anonymous

Anonymous Thu 11 Mar 2021 04:39:41 No.12817869 Report

Quoted By: >>12817881 >>12817885

>>12817858
No its just cancelling, if you have the same term on both sides its equal and you just cancel. How fucking stupid are you?

Anonymous

Anonymous Thu 11 Mar 2021 04:42:28 No.12817881 Report

Quoted By: >>12817963

>>12817869
>The irony
Back to pre-algebra with you

Anonymous

Anonymous Thu 11 Mar 2021 04:44:46 No.12817885 Report

Quoted By: >>12817963

>>12817869
> cancelling, the action of dividing or multiplying both sides of an equation by the same factor.
back to primary school for you kiddo

Anonymous

Anonymous Thu 11 Mar 2021 04:45:07 No.12817887 Report

Quoted By: >>12817896 >>12817904

>>12817767
stupid question but how is this done? isn't (a-b) / (a-b) just 1? and wtf is (a+b) / (a-b)? am i reading this wrong?

Anonymous

Anonymous Thu 11 Mar 2021 04:46:51 No.12817896 Report

Quoted By: >>12817940

>>12817887
x*1=x

Anonymous

Anonymous Thu 11 Mar 2021 04:47:14 No.12817897 Report

Quoted By:

>the smartest board, /sci/, gentlemen

Anonymous

Anonymous Thu 11 Mar 2021 04:49:13 No.12817904 Report

Quoted By: >>12817920

>>12817887
x/x is only defined for x != 0 and x != infty

Anonymous

Anonymous Thu 11 Mar 2021 04:53:40 No.12817920 Report

Quoted By: >>12817923 >>12817928

>>12817904
There is no zero or infinity in the OP problem though so that's not relevant at all.

Anonymous

View Same Google iqdb SauceNAO ARRRRRRHAT.png, 1MiB, 1249x653

Anonymous Thu 11 Mar 2021 04:54:24 No.12817923 Report

Quoted By:

>>12817920
there's an inf_hat though

Anonymous

Anonymous Thu 11 Mar 2021 04:55:57 No.12817928 Report

Quoted By: >>12817937

>>12817920
$(a - b)$ where $a=b$

have your (You)

Anonymous

View Same Google iqdb SauceNAO hur.png, 90KiB, 349x642

Anonymous Thu 11 Mar 2021 04:55:58 No.12817929 Report

Quoted By:

>>12817849

El Arcón

View Same Google iqdb SauceNAO TIMESAND___1008698b698sd6b98sdtk (...).jpg, 7KiB, 386x264

El Arcón Thu 11 Mar 2021 04:58:42 No.12817934 Report

Quoted By: >>12817937

If a=b, then dividing by (a-b) at this step is division by zero. This is not allowed.

Anonymous

Anonymous Thu 11 Mar 2021 04:59:00 No.12817935 Report

Quoted By:

>>12817809
>algebra 1
or do you mean 2

Anonymous

Anonymous Thu 11 Mar 2021 05:00:12 No.12817937 Report

Quoted By: >>12817943 >>12818220 >>12818775 >>12819146

>>12817928
>>12817934
It's not zero though. It's a-b which isn't zero until it is computed. It's being cancelled out or balanced or whatever you want to call it before that happens.

Anonymous

Anonymous Thu 11 Mar 2021 05:00:40 No.12817940 Report

Quoted By: >>12817951

>>12817896
so (a+b)(a-b) / (a-b) = (a+b)1 = a+b? i don't get it

Anonymous

Anonymous Thu 11 Mar 2021 05:01:48 No.12817943 Report

Quoted By: >>12817945

>>12817937
sure bud 1=2 and your mom isn't fat

Anonymous

Anonymous Thu 11 Mar 2021 05:01:49 No.12817944 Report

Quoted By:

a=b
a-b=0
a-a=0
0=0

Other mathematical derivations violate the identity of indiscernibles. If you want to justify other derivations as valid you need to show why the principle of the identity of indiscernibles does not hold.

Anonymous

Anonymous Thu 11 Mar 2021 05:03:00 No.12817945 Report

Quoted By:

>>12817943
dude, he clearly ate 0 calories today, he's just big boned with a slow metabolism

Anonymous

Anonymous Thu 11 Mar 2021 05:07:48 No.12817951 Report

Quoted By: >>12817958

>>12817940
1 is the multiplicative identity element

Anonymous

Anonymous Thu 11 Mar 2021 05:12:22 No.12817958 Report

Quoted By: >>12817964

>>12817951
i know that but what does it have to do with what i just posted? where does the b(a - b) come from in the OP pic? explain this shit

Anonymous

Anonymous Thu 11 Mar 2021 05:13:31 No.12817963 Report

Quoted By: >>12817968

>>12817881
>>12817885
How many times do I have to explain it? It's the same on both sides so you just cross it out. It's called cancelling. If it was division there would be a divider sign you morons. Show me the fucking divider sign. Hint: It's not fucking there.

Anonymous

Anonymous Thu 11 Mar 2021 05:14:38 No.12817964 Report

Quoted By: >>12817973

>>12817958
Are you kidding? It comes from factoring

Anonymous

Anonymous Thu 11 Mar 2021 05:15:40 No.12817968 Report

Quoted By: >>12817993

>>12817963
>Imagine being this retarded

Anonymous

Anonymous Thu 11 Mar 2021 05:17:37 No.12817973 Report

Quoted By: >>12817979

>>12817964
oh i thought he was saying it was thru division...

but then how do you get a + b in step 5? Isn't b(a-b) / (a-b) literally just b? how can you deduce from this that a + b = b?

Anonymous

View Same Google iqdb SauceNAO cb66677cb7d2fcc1b21cf05092a0a57a.png, 332KiB, 941x679

Anonymous Thu 11 Mar 2021 05:18:31 No.12817977 Report

Quoted By:

>>12817746
$(a-b)$
where
$a=b$
does not have a multiplicative inverse

Anonymous

Anonymous Thu 11 Mar 2021 05:21:21 No.12817979 Report

Quoted By: >>12817984

>>12817973
That's where the division by 0 comes in. Why do you need me to hold your hand through a troll problem?

Anonymous

Anonymous Thu 11 Mar 2021 05:24:59 No.12817984 Report

Quoted By: >>12817987

>>12817979
even if i ignore the division by 0 i still can't get a+b = b from b(a-b)

Anonymous

Anonymous Thu 11 Mar 2021 05:28:32 No.12817987 Report

Quoted By: >>12817992

>>12817984
Are you retarded?

(a+b)(a-b)/(a-b)=a+b

b(a-b)/(a-b)=b

Now put both sides together

a+b=b

Anonymous

Anonymous Thu 11 Mar 2021 05:30:48 No.12817990 Report

Quoted By: >>12818032

>/sci/ a board so smart we don't know if it's trolls or teenage idiots posting stupid comments

Anonymous

Anonymous Thu 11 Mar 2021 05:30:56 No.12817992 Report

Quoted By: >>12818009

>>12817987
ohh i was only dividing the rhs im dumb

Anonymous

Anonymous Thu 11 Mar 2021 05:31:19 No.12817993 Report

Quoted By: >>12818004

>>12817968
>imagine being this wrong and thinking everyone else is retarded

cancelling $\neq$ division

Anonymous

Anonymous Thu 11 Mar 2021 05:33:33 No.12818004 Report

Quoted By: >>12818013

>>12817993
>Imagine being this retarded

Anonymous

Anonymous Thu 11 Mar 2021 05:35:50 No.12818009 Report

Quoted By:

>>12817992
I'm sure I've made dumber mistakes

Anonymous

Anonymous Thu 11 Mar 2021 05:39:04 No.12818013 Report

Quoted By: >>12818021 >>12818028

>>12818004
ok retard tell me how you divide when there isn't a divider sign lmao

Anonymous

Anonymous Thu 11 Mar 2021 05:40:25 No.12818014 Report

Quoted By:

>>12817809
Let me guess, engineering?

Anonymous

Anonymous Thu 11 Mar 2021 05:41:45 No.12818021 Report

Quoted By: >>12818025 >>12818027

>>12818013
How do you cut a pie of pizza without a physical division symbol?

Anonymous

Anonymous Thu 11 Mar 2021 05:43:04 No.12818025 Report

Quoted By: >>12818030

>>12818021
>food analogy
Shouldn't the Americans be in bed by now?

Anonymous

Anonymous Thu 11 Mar 2021 05:43:52 No.12818027 Report

Quoted By: >>12818181

>>12818021
with a knife stupid or one of those pizza roller things

Anonymous

Anonymous Thu 11 Mar 2021 05:44:06 No.12818028 Report

Quoted By: >>12818039 >>12818141

>>12818013
>Imagine being this retarded
Division cancels out multiplication. Cancelling is not a mathematical operation

Anonymous

Anonymous Thu 11 Mar 2021 05:44:39 No.12818030 Report

Quoted By:

>>12818025
West coast represent

Anonymous

Anonymous Thu 11 Mar 2021 05:45:33 No.12818032 Report

Quoted By:

>>12817990
>implying the smart user base doesn't know it's an obvious bait
>implying some trolls aren't teenager idiots

Anonymous

Anonymous Thu 11 Mar 2021 05:47:06 No.12818039 Report

Quoted By: >>12818046

>>12818028
>Division cancels out multiplication. Cancelling is not a mathematical operation
Now you're just making shit up. What the fuck are you talking about?

Anonymous

Anonymous Thu 11 Mar 2021 05:48:17 No.12818046 Report

Quoted By:

>>12818039
>Imagine being this retarded

Anonymous

Anonymous Thu 11 Mar 2021 05:57:24 No.12818078 Report

Quoted By:

>imagine keeping to bite

Anonymous

Anonymous Thu 11 Mar 2021 06:01:48 No.12818091 Report

Quoted By:

You dumb shits. Oh my god. It's not fucking rocket science. Between steps 4 and 5 is the problem. Both sides of the equation are being divided by (a - b). The problem is that (a - b) = 0, so the left-hand side becomes ((a+b)*0)/0 which becomes 0/0. 0/0 is considered an indefinite form because it DOESN'T NECESSARILY MEAN 1, or any number for that matter. When doing algebra, always make sure the denominator does not equal zero when you are factoring.

Anonymous

View Same Google iqdb SauceNAO 1615435295853.png, 305KiB, 555x385

Anonymous Thu 11 Mar 2021 06:24:07 No.12818135 Report

Quoted By:

>imagine getting baited THIS hard

Anonymous

Anonymous Thu 11 Mar 2021 06:28:07 No.12818141 Report

Quoted By: >>12818155

>>12818028
Yes it fucking is a mathematical operation. You have the same thing on both sides, so you cross it out. It's equal because you have the same thing on both sides.

Anonymous

Anonymous Thu 11 Mar 2021 06:35:58 No.12818155 Report

Quoted By:

>>12818141
>Imagine being this retarded

Anonymous

Anonymous Thu 11 Mar 2021 06:36:21 No.12818157 Report

Quoted By:

Anonymous

View Same Google iqdb SauceNAO edge.jpg, 85KiB, 1053x1200

Anonymous Thu 11 Mar 2021 06:48:31 No.12818181 Report

Quoted By: >>12818403

>>12818027

Anonymous

Anonymous Thu 11 Mar 2021 07:09:07 No.12818220 Report

Quoted By:

>>12817937
lol faggot

Anonymous

Anonymous Thu 11 Mar 2021 07:52:50 No.12818299 Report

Quoted By:

>>12817830
I think he implied x = 0.9999999999...

Anonymous

Anonymous Thu 11 Mar 2021 08:17:05 No.12818403 Report

Quoted By:

>>12818181
lol what's your point he asked how I'd cut a pizza and I answered him you people are fucking dumb and gay

Anonymous

Anonymous Thu 11 Mar 2021 08:30:46 No.12818456 Report

Quoted By:

at first you seemed to realize it was bait but as soon as he doubled down even a little bit on the bait you fucking retards couldn't help yourselves from jumping face first into that fucking fishing net.

Anonymous

Anonymous Thu 11 Mar 2021 08:51:40 No.12818495 Report

Quoted By:

>>12817760
are you retarded

Anonymous

Anonymous Thu 11 Mar 2021 08:55:26 No.12818500 Report

Quoted By:

>>12817809
I don't care it's bait, this is comedy gold

Anonymous

Anonymous Thu 11 Mar 2021 09:50:30 No.12818596 Report

Quoted By:

>As another example, if a×b=a×c, then the multiplicative term a can be canceled out if a?0, resulting in the equivalent expression b=c; this is equivalent to DIVIDING through by a.

Anonymous

Anonymous Thu 11 Mar 2021 11:13:49 No.12818775 Report

Quoted By:

>>12817746
In between the 4th and the 5th line, you are dividing both sides by a - b, and because a = b, a - b = 0, You cannot divide by 0 therefor from line 5 onward every value is undefined.

>>12817937
>>12817760
>>12817809
lol had a laugh

Anonymous

Anonymous Thu 11 Mar 2021 12:42:48 No.12818971 Report

Quoted By:

>83 replies to this 15 year old facebook bait

Yup, all i needed to know this board is filled with idiots. I’ll fuck off back to biz

Anonymous

Anonymous Thu 11 Mar 2021 13:24:04 No.12819051 Report

Quoted By: >>12819092 >>12819149

>>12817754
it literally does

Anonymous

Anonymous Thu 11 Mar 2021 13:41:28 No.12819092 Report

Quoted By:

>>12819051
it literally does not retard
x*0 = y*0 does not imply x = y

Anonymous

Anonymous Thu 11 Mar 2021 13:43:56 No.12819098 Report

Quoted By: >>12819132

>>12817754
Its arguing that zero is a number, which it is not, it is a word that describes a lack of anything, null if you will.

Anonymous

Anonymous Thu 11 Mar 2021 14:07:18 No.12819132 Report

Quoted By:

>>12819098
retard deluxe

Anonymous

Anonymous Thu 11 Mar 2021 14:16:09 No.12819146 Report

Quoted By:

>>12817937
it is zero.
it is zero at any point so long as you state a = b
a - b = 0
zero if on both sides.
thus
0 = 0

Anonymous

Anonymous Thu 11 Mar 2021 14:16:56 No.12819149 Report

Quoted By: >>12819616

>>12819051
>0=0 implies 1=0

Anonymous

Anonymous Thu 11 Mar 2021 15:52:03 No.12819426 Report

Quoted By:

>>12817760
Lol ok

Anonymous

Anonymous Thu 11 Mar 2021 15:59:41 No.12819452 Report

Quoted By: >>12819482

>>12817746
Niggers divide by zero and pretend like they disproved math or smth. You learn that shit in middle school.

Anonymous

Anonymous Thu 11 Mar 2021 16:10:57 No.12819482 Report

Quoted By: >>12819604 >>12819629 >>12820959

>>12819452
>Look at me mom I can say the N word
racism is not welcome here

Anonymous

Anonymous Thu 11 Mar 2021 16:53:46 No.12819604 Report

Quoted By:

>>12819482
LOL

Anonymous

Anonymous Thu 11 Mar 2021 16:56:14 No.12819610 Report

Quoted By: >>12819633

>>12817809
there is no fucking way this guy isnt trolling. made me laugh, thanks.

Anonymous

Anonymous Thu 11 Mar 2021 16:57:01 No.12819616 Report

Quoted By:

>>12819149
Virtual particles

Anonymous

Anonymous Thu 11 Mar 2021 17:01:30 No.12819629 Report

Quoted By: >>12819639

>>12819482
Tits or gtfo

Anonymous

Anonymous Thu 11 Mar 2021 17:02:06 No.12819632 Report

Quoted By: >>12821846

>>12817809
this is the way I was taught in middle/high school too. Took me until late high school to realize it was actually division

Anonymous

Anonymous Thu 11 Mar 2021 17:02:29 No.12819633 Report

Quoted By:

>>12819610
What if he's an engineer?

Anonymous

Anonymous Thu 11 Mar 2021 17:04:18 No.12819639 Report

Quoted By: >>12819699

>>12819629
racist and misogynist, big yikes

Anonymous

Anonymous Thu 11 Mar 2021 17:16:59 No.12819680 Report

Quoted By:

>>12817746
If a=b then a-b=0
3rd passage is 0=0 and you can't make assumptions past that.

Anonymous

View Same Google iqdb SauceNAO 1613948440307.jpg, 77KiB, 750x1024

Anonymous Thu 11 Mar 2021 17:20:31 No.12819699 Report

Quoted By:

>>12819639
Not him, but pls dear, open bobs and vagene pls dear, hurree bootiful dear pls.
ur r beeuty dear.

Anonymous

Anonymous Thu 11 Mar 2021 22:40:43 No.12820877 Report

Quoted By: >>12820976

>>12817746
We divided by zero, thus we're in the zero ring, thus 2=1=0. No contradiction.

Anonymous

Anonymous Thu 11 Mar 2021 22:44:37 No.12820893 Report

Quoted By:

>>12817809
kek

Anonymous

Anonymous Thu 11 Mar 2021 23:12:29 No.12820959 Report

Quoted By:

>>12819482
based

Anonymous

Anonymous Thu 11 Mar 2021 23:16:56 No.12820976 Report

Quoted By:

>>12820877
>we're in the zero ring, thus 2=1=0.
sounds like a good premise for a shitty scifi flick

Anonymous

Anonymous Fri 12 Mar 2021 04:39:33 No.12821846 Report

Quoted By:

>>12819632
Same, still hate my teacher for teaching it like that.

Anonymous

Anonymous Fri 12 Mar 2021 04:41:27 No.12821851 Report

Quoted By:

Trolls trolling trolls. 4chan at it's finest.

Anonymous

Anonymous Fri 12 Mar 2021 04:42:30 No.12821857 Report

Quoted By: >>12822159 >>12822249

Yall want a real troll not like this dipshit?

x^2/x and x are not the same function

Anonymous

Anonymous Fri 12 Mar 2021 04:46:27 No.12821870 Report

Quoted By: >>12821904

In case anyone is wondering, the problem is that step 4 takes the square root of b. All square roots have two answers : the positive and the negative. You are supposed to solve roots for both + and - and throw away the one that's illogical. OP only does the + side and arrives at an illogical conclusion.

Anonymous

Anonymous Fri 12 Mar 2021 05:00:13 No.12821904 Report

Quoted By:

>>12821870
>square roots have two answers
nope
$<br />\sqrt {x^2} \ne \pm x, \quad \sqrt {x^2} = \left | x \right |<br />$

Anonymous

Anonymous Fri 12 Mar 2021 07:06:03 No.12822159 Report

Quoted By: >>12823330

>>12821857
They indeed are not.

Anonymous

Anonymous Fri 12 Mar 2021 07:39:45 No.12822249 Report

Quoted By: >>12823330

>>12821857
true

Anonymous

Anonymous Fri 12 Mar 2021 11:36:38 No.12822694 Report

Quoted By:

i = sqr(-1)
i x i = - 1
sqr(a x b) = sqr(a) x sqr(b)

2 = 2
2 = 1 + 1
2 = 1 + sqr(1)
2 = 1 + sqr((-1) x (-1))
2 = 1 + sqr(-1) x sqr(-1)
2 = 1 + i x i
2 = 1 + (-1)
2 = 0

Anonymous

Anonymous Fri 12 Mar 2021 11:55:41 No.12822730 Report

Quoted By:

>>12817746
a=b
aa=ab
aa-bb=ab-bb=0
(a+b)(a-b)=b(a-b) -> a+b(0)=b(0)=0
The next step divide by 0 so that's not possible.
It's bad bait(as in it's so easy to disprove), really if a=b then why would you keep them separate for further manipulations?

Anonymous

Anonymous Fri 12 Mar 2021 12:03:10 No.12822745 Report

Quoted By: >>12823409

>>12817746
>a+b=b
>2b=b
????

Anonymous

Anonymous Fri 12 Mar 2021 16:42:25 No.12823330 Report

Quoted By: >>12823350

>>12822249
>>12822159
b-b-b-b-but x^2/x = x if you cancel, right

Anonymous

Anonymous Fri 12 Mar 2021 16:46:10 No.12823350 Report

Quoted By: >>12823361

>>12823330
>x^2/x = x
true only for non-zero x

Anonymous

Anonymous Fri 12 Mar 2021 16:48:59 No.12823361 Report

Quoted By:

>>12823350
exactly, so cancellation is a meme unless ur sure your argument is not 0

Anonymous

Anonymous Fri 12 Mar 2021 16:52:38 No.12823376 Report

Quoted By:

>>12817760
Multiplication is just division by a reciprocal.
OP divided by infinity

Anonymous

Anonymous Fri 12 Mar 2021 17:01:50 No.12823402 Report

Quoted By:

>>12817760
The ABSOLUTE state of sci

Anonymous

Anonymous Fri 12 Mar 2021 17:03:36 No.12823409 Report

Quoted By:

>>12822745
the very first equation is "a=b"

Anonymous

Anonymous Fri 12 Mar 2021 17:14:54 No.12823464 Report

Quoted By:

>>12817746
>>12817747
cringe

>>12817754
>>12817758
based

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