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Only a fool would take anything posted here as fact.

Only a fool would take anything posted here as fact.

Thread replies: 187

Thread images: 19

Thread images: 19

Can you?

>>

>>685445066

https://www.wolframalpha.com/

/thread

Everyone below this post got trolled.

>>

>>685445066

not doing your fucking homework

>>

>>685445066

Can u not

>>

>>685445066

Tell me one way your equation relates to reality

>>

log(12*sin(32))

>>

>>685445237

ehm, all jobs that count nowadays are math-heavy?

>enjoy flipping burgers or asking "what size would you like those pants in, sir?" for ur whole life

>>

-16

>>

>>685445149

https://www.wolframalpha.com//thread

page not found

>>

-13

>>

-14

>>

-15

>>

>>685445066

-12 biotch

>>

>>685445066

Dis gon be easy nigga

4+3-(5*(2^2))+2-(((4^(1/2))-3)^2)

9-(5*4)-((2-3)^2)

9-20-((-1)^2)

-11-1

-12

>>

-14

>>

>>685445659

4+3=7, not 9.

>>

>>685445066

“P or not-P, that is the question”

>>

>>685446023

I collected the other loose +2 in the 9

>>

>>685445869

(-1)^2 is +1

>>

>>685445659

This

>>

-12. Next.

>>

It's -12

>>

Next round. Getting harder.

>>

>>685447763

I always sucked at the functions, can someone maybe explain ?

>>

it's -12

>>

>>685447763

Well, given the starting point, we can find all the values for ascending odd inputs starting from 3:

f(3) = 5

f(x) = f(x-2) + 1

f(5) = f(5-2) + 1 = f(3) + 1 = 5 + 1 = 6

f(7) = f(7-2) + 1 = f(5) + 1 = 6 + 1 = 7

f(9) = f(9-2) + 1 = f(7) + 1 = 7 + 1 = 8

f(11) = f(11-2) + 1 = f(9) + 1 = 8 + 1 = 9

So are we allowed to assume that the function is continuous and linear? If so:

f(x) = x/2 + 7/2 = (x + 7)/2

And hence:

f(4) = (4 + 7)/2 = 11/2 = 5.5

>>

4 + 3 - 5 * 2^2 + 2 - (4^.5 - 3)^2

4 + 3 - 5 * 2^2 + 2 - (2 - 3)^2

4 + 3 - 5 * 2^2 + 2 - (-1)^2

4 + 3 - 5 * 4 + 2 - 1

4 + 3 - 20 + 2 - 1 = -12

ez

>>

its -12 in my brain. that will do.

>>

7-20+2+1 = -10

>>

>>685445066

PEDMAS

4+3-5*2^2+2-(sqrt(4)-3)^2=

4+3-5*2^2+2-(2-3)^2=

4+3-5*2^2+2-1^2=

4+3-5*4+2-1=

4+3-20+2-1=-14

>>

>>685449399

-(-1)^2 = -1 => 7-20+2-1 = -12

>>

>>685449666

Learn to arithmetic you stupid cunt.

4+3-20+2-1=

7+1-20=-12

>>

I bet you can't this time.

>>

>>685450361

Full image would help bro

>>

- 12

>>

>>685445066

-10

-(-1) means it has to be added, not subtracted. Many seem to miss that part.

>>

>>685445275

0.8033909538

you literally just told me what to put into my calculator. Gj man that was a fucken tuff one you are rain man

>>

>>685451338

a square is always positive. Many seem to miss that part.

>>

>>685451338

-(-1)^2=-1

>>

>>685451260

squaring the -1 makes it positive, which you missed

>>

>>685448770

thats a stupid way someone who didnt learn american solutions please explain

>>

Glad other people are getting -12, the rest are autistic

>>

>>685445066

7-20+2-1= -12

Everybody not knowing that is an insanely stupid wanker.

>>

>>685451557

and the negative sign before the brackets makes it negative again.

Which you missed

>>

am i good at math if i can do this in my head?

>>

>>685445066

-12

>>

-12

>>

>>685451749

FUKEN SCHOOOOLED SON

>>

>>685445066

>4+3-5*2^2+2-(2-3)^2

>4+3-5*4+2-1

>4+3-20+4-1

>11-20

>-10

>>

>>685451815

It's a pretty easy question, anyone who's moderately intelligent could do it in their head.

Unfortunately there's a lot of people who probably couldn't do it in their head.

>>

>>685451730

Mate, I'm glad you got the right answer, but root of 4 = 2, thus 2-3 = -1, and -1^2 = 1

>just

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>>685445449

Lel

>>

>>685445237

Oh, the poor fool.

>>

>>685451967

so youre saying im a math god

>>

>>685451979

yeah thanks, i realised that would have been easier shortly after I finished but oh well

>>

>>685451519

It can be explained like this:

>Americans

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>>685451893

you're wrong, you fucked it up completely on the third line

>>

-12 is the right answer.

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>>685452177

you are right

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>>685448770

That's some assumption you're making there. Can you prove that's the case for all recursive functions of this type?

>>

>>685452085

He's saying you're merely average, wank stain

>>

>>685451979

-1^2 = -1

I think you mean (-1)^2 = 1

>>

I'm a fan of these maths question threads, would anyone be interested in more if I made them every now and again

maybe even other topics than maths

>>

>>685445066

-12

>>

>>685452361

Yeah we all love doing basic math and feeling superior because most people are shyte at it.

>>

>>685452314

haha look at the filthy cunt who couldnt solve it in his head.

I am your god now math peasants bow to my almighty powers. I am rain man without the retard

>>

>>685452361

>>685452435

pretty much this lmao

>>

>>685452435

Right I'm gonna make one now. Hope some of you fags know how to integrate

>>

Not this time /b/.

>>

>>685447763

The function increases by 1 for every 2 x

Assuming it's linear, it increases by 1/2 for every 1 x

f(3) =5

=>

f(4) =5.5

Easy.

Neeeext

>>

>>685452245

>That's some assumption you're making there. Can you prove that's the case for all recursive functions of this type?

Not that guy. Also not sure how to prove it, but fairly certain that the only solutions to f(x) = f(x+a)+b are the linear functions with the appropriate slope.

>>

>>685452859

can you prove this and post pic. Havent done functions in years

>>

>>685452740

28+21+12= 61

Next

>>

>>685452245

>>685453061

Sorry, was wrong.

>>

>>

>>685453104

What i did was read the info and comprehend it really.

It's more an issue of understanding than proving.

But i'll try to explain

f(x) = f(x-2) +1

This means that increasing x by 2, increases f(x) by 1

f(x)-f(x-2)=1

In other words

f(x+2)-f(x)=1

If x=3,

f(5)-f(3)=1

Divide both sides by two

(f(5)-f(3))/2=1/2

Realize the first part is really f(4)-f(3)

f(4)-f(3)=1/2

f(4)=f(3)+1/2

Insert value for f(3)

f(4)=5+1/2

You can take it from here

Fuck i accidentally proved it.

Oh well

>>

>>685454272

>(f(5)-f(3))/2=1/2

>Realize the first part is really f(4)-f(3)

That's where you're wrong. Or where your implicit assumption of a linear function is hidden.

>>

>>685451730

>>685451979

EVERYONE IS FORGETTING THE FACT THAT THE SQUARE ROOT OF 4 IS +2, OR -2. SO THE QUESTION HAS MULTIPLE ANSWERS!!!!!!!!!

>>

>>685454272

It just clicked

f(x)=f(x-2)+1

this means that increasing x by 2, increases f(x) by 1

thanks mate

>>

>>685445066

I did just now

http://frtyd.com/go/gQ0i_bAaEj/Pizzapls

>>

>>685455264

This is true, made the mistake myself

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>>685454613

yes but he can see it is linear because if x is increased by 2 f(x) is increased by one.

>>

>>685455264

>THE SQUARE ROOT OF 4 IS +2

No, you don't define the square root like that.

>>

>>685455264

hes an absolute madman!

a math genius right here lads and gents

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>>685445066

-92

>>

>>685455264

but you square it dipshit

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>>685455264

Nope, √4 = only 2

>>

How do I get gud at math?

I mean math, not calculating things.

I've basically forgotten all of my A-Level knowledge from High school and I wanna go to University.

How do you learn math in an effective, fast way?

Getting the concepts and mechanism down, abstract concepts in a way you can understand it, ...

Maybe there is some math wizard (Math graduate) in here.

>>

>>685454613

>that's where you're wrong

My first post clearly states

>assuming that the function is linear

You stupid cunt

>>

>>685455779

>yes but he can see it is linear because if x is increased by 2 f(x) is increased by one.

That doesn't make sense.

IF you assume a linear function, the answer is correct. I can give you a lot of other functions that fulfill the given criteria which are not correct.

For example, take a function periodic in 2 and add it to your linear solution.

f(x)=1/2*x + 3.5

is your solution

g(x)=1/2*x + 3.5 + sin(pi*(x-1) / 2)

is another one.

>>

>>685456284

khanacademy

>>

>>685456284

salman khan is math wizard you seek

>>

>>685456528

well then the question is fucking impossible without being specified

>>

>>685456394

>My first post clearly states

>>assuming that the function is linear

>You stupid cunt

> My first post

Not the one I replied to. Meh.

>>

>>685456284

I'd recommend going to the AQA or OCR or whatever website and downloading a bunch of past papers and mark schemes. It'll all start coming back to you quickly

>>

>>685456271

Nope. (-2)*(-2)=4, so √4 can equal -2

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>>685456653

>well then the question is fucking impossible without being specified

Yes. So what?

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>>685445066

I get 1 / (1 + 2 + 3 + 4 + ... + N + ...), but I can't seem to simplify it any further. Any help?

>>

>>685445066

-12

>>

>>685455264

How about this?

>>

>>685445066

>>685445066

-14 easy.

>>

>>685456759

>Nope. (-2)*(-2)=4

Yes

>so √4 can equal -2

Does not follow.

The reasonable definition of sqrt(y) is "the positive solution of x*x=y" for positive reals y.

>>

>>685445066

It's negative twelve. What do I win?

>>

>>685456759

u wot m8?

>>

>>685456784

so quit being a fag its clearly ment to be linear

you dont tell a year 3 learning what a square root is about how - numbers = can equal positive.

>>

Did half of you faggots even pass High School? The square root of a number only gives the positive value per definition

>>

>>685457038

lmao ffs cunt

>>

>>685457151

is this a troll in a maths thread

>>

>>685456759

In my book there's a difference between √x and x^1/2 - √x is the value of x^1/2 with a branch cut taken from -infinity to 0. So (4)^1/2 is multivalued, but √4 is not.

>>

>>685455264

>Being this retarded

>Unable to do basic algebra

If the equation gives you the square root you assume it's positive unless stated otherwise.

If you introduce the root into the equation, then you have to account for both.

>>

>>685457089

Where did you specify "only for 3rd graders"?

You under8 b&?

>>

>>685457151

Root of a number is defined by any number times itself = said number you are trying to find root of.

-2x-2 = 4 2x2= 4

Square root of four is

-2 and 2

>>

-12

>>

>>685457433

>Root of a number is defined by any number times itself = said number you are trying to find root of.

No, it's not. It's defined to be positive.

>>

>>685457362

well your book is retarded because by definition

√x = x^1/2

meaning there is no difference.

>>

>>685457433

From wikipedia: "Every non-negative real number a has a unique non-negative square root, called the principal square root, which is denoted by √a"

>>

>>685452032

Yep. He probably doesn't know that math is the backbone of science or about every fucking thing we do because he's a bus boy

>>

>>685445656

This.

>>

-12 or 14

>>

-12.

>>

>>685445066

Yes, but I'm too lazy. just PEMDAS that bitch

>>

>>685457396

jesus christ youre that kid who aced math but not a social life.

The question is obviously not at the level in which you answered wether it was specified or not quit being a faggot trying to show off your highschool math skills you poofy little cunt

>>

>>685457789

>PEMDAS

>Doesn't have a letter for "Square root"

WHERE IS YOUR GOD NOW

>>

>>685457524

are you ok? had ur pills today

>>

>>685445066

this is so fucking easy. even a 12 year old could figure this out how old are you underraged faggot?

>>

-12

>>

>>685457636

YES IT IS DENOTED BY THAT

but you know what is ALSO denoted by that

the negative root

genius.

>>

>>685445066

-24 + 6√4

Everyone happy now?

>>

isnt it -11?

>>

>>685445659

I m astounded by the fact that we're even discussing this, are /b/tards really this fucking stupid? (not refferring to your post, just in general and yes of course that's the answer)

>>

>>685458224

lmao gj bro you can use surds.

This is a pedmas question

>>

>>685458266

-11-1

>>

>>685458208

Except it isn't, because that's -√a

I'll have you know I graduated magna cum loudly from Harvard 5 years ago and this is the sort of shit that would get you laughed at there. Maybe if you weren't so fucking stupid you'd understand.

>>

>>685458371

right, i am dum and didnt notice the - before the brackets, yeye

-12 4 sure boys

>>

>>685452173

/thread

litterally this, an 11 y o french kid can figure it out without even having to think. what is wrong with their country?

>>

Most condensed form.

1±13

>>

>>685458600

Show me how you get 14.

I get -24 ± 12.

>>

>>685452468

Well, you're 1/2 right, my lord

>>

4+3-5*4+2-(2-3)^2

4+3-20+2-(-1)^2

4+3-20+2-1

9 - 21

-12

>>

>>685457365

Are you retarded? There is no assuming. Math has specific values.

>>

>>685458443

So harvard never learnt + - signs

√4 = +-2

-√4 = + - 2

essentially you times the answer by a negative and flip the answers. Glad you graduated in taking cum at harvard maybe nextime focus on math and not jizz

>>

>>685452548

Segregation, not integration

>>

>>685445066

>order of operations

>math

>>

Funfact: Americans are learning the math in college we already learn in germany in high school, but we cover it even there more deeply.

Burgers have in their 2nd year college the same level of math we had in grade 11. GG education

>(except pure math programs)

>>

>>685458911

lel dude, i wish i grew up in germany (would have left by now) ausfag here, school system not as bad as US but is getting there rip

>>

>>685451519

europe, australia, america, russia

square root of 4 = +-2

>>

>>685445066

-12

>>

>>685445066

-180

>>

-12 If I'm not mistaken

>>

>>685458911

fun fact: your country is filled with rapist muslims who will soon shroud all your women and kill all the infidels

>>

>>685459183

ahem* ahem** /thread

>>

>>685457956

My God? He's right here:

>>685452468

>>

Let's see how clever you really are /b/.

Added constraint of boundary conditions of y=y'=1 at x=0.

>>

√4 is only equal to a single value, which is 2. However, when you construct an algebraic expression, like "4=x^2", then x has two different solutions, which are 2 and -2. These values of x are not equal, otherwise any number would then be equal to it's negative counterpart, which would break arithmetic. For an example; 4-3=1. But 4 would then technically be equal to √16, which is then equal to -4. This would mean that 4-3=-7=1. But the algebraic expression "x=√16 -3 would have two solutions, being -7 and 1.

Is it really so hard to understand?

>>

Its 9

>>

ain't doing your homework op

>>

>>685459483

ok i am wrong sorry cumman

>>

>>685458911

That's only true for the poorest of American schools for students who take the "normal" ciriculum, but at my high school most students were in the "advanced" courses and we learned college level calc 2 in junior year.

>>

>>685459844

What is college level calc 2

>>

>>685459468

go away

>>

>>685456895

This is retarded

>>

>>685445066

Parenthesis first

square root of 4= 2

2-3=-1

-1 squared= 1

Then mulitplation

2 squared= 4

5*4=20

Addition and subtraction

20+2=22

4+3=7

7-22=-15

-15-1= -16

>>

>>685459931

its highschool calculus in a private school so this guy thinks hes mad smart

>>

>>685451730

>Reply to Thread No.685445066

How come the (-3/4)s don't cancel out?

>>

>>685451338

I too got -10. These cucks can't math properly

>>

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>>685451519

>square is always positive

>(i)^2

>talks about 'many'

>>

>>685445066

The answer is 9. You're welcome.

>>

>>685460085

thank you god for not making me this stupid

>>

>>685460085

BODMAS works so much better than silly american way. Stops things like this from happening

>>

>>685460265

U wot m8

Bodmas is canonically isomorphic to pemdas

>>

>>685460056

Make me.

>>

>>685459483

ok man ima break it down for you.

THE SQUARE ROOT OF X

has twwwwwwwwoo answers. Two seperate answers. Just because √4 = + or - 2

doesnt mean that -2= 2

it means that the two possible solutions are

-2

OR

2

ok harvard cum degree?

okay??

>>

>>685459931

Multiple partial derivatives and all the extra tricks to solve complex integrals. Basic limits, derivatives, and integrals are calc1.

>>685460117

I went to public school, faggot. It just wasn't an innercity, nignog infested shithole.

>>

>>685445066

all you fucking retards need to go back to school

The answer is 0

>4+3-5*2^2+2-(sqroot4 - 3)^2

>4+3-5*2^2+2-(4+9- 2*4*3)

>4+3-5*2^2+2-(13-24)

>4+3-5*2^2+2-(-11)

>4+3-5*2^2+2+11

>4+3-5*4+2+11

>4+3-20+2+11

>7-20+13

>13+13

0

>>

>>685460072

Why?

>>

>>685445066

As always, PEMDAS

4+3-5*2^2+2-(√4-3)^2

4+3-5*2^2+2-(√4-3)(√4-3)

4+3-5*2^2+2-(4-√4(3)-√4(3)+9)

4+3-5*2^2+2-(13-6√4)

4+3-5*4+2-(13-6√4)

4+3-20+2-(13-6√4)

7-20+2-13+6√4

-13+2-13+6√4

-11-13+6√4

-24+6√4

-24+6*2

-24+12

-12

Google it faggots

>>

>>

>>685460380

yes but in a much simpler way.

BRACKETS not parenthesis which confuses people like >>685460085

>>

>>685460117

oh so you did high level highschool maths. Congratz man thats super unusual never seen anyone do that.

Your school must be ahead of other nations there buddy wow fuck me why even bother going to uni I think you should apply to NASA

>>

>>685445066

-12

>>

>>685460862

Use BIDMAS in the UK. Brackets, Indices, etc.

>>

>>

>>685445066

-12

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