48/2(9+3)=?

[MVC NVMXD JVRXD 2,406]

>all of these responses

well that's like your opinion man

[Jokuc 8,172]

People who say 2:

[Ashley 2,427]

This is more popular then it should be.

I still don't have an answer.

[Crystallize 279]

I don't understand why some of you get 2 as the answer. It's 288 isn't it! I think many of you are looking at the question the wrong way. Even when you put it in a calculator it comes out as 288.

Edited May 26, 2013 by Sirwest299

[Unpredictable Ranger 696]

42: The answer to life, the universe and everything

 

[Shift 4,271]

4x^2+76x*4y-1508 = 12xy

 

Edited May 26, 2013 by Jolteon

[Unpredictable Ranger 696]

@, I SAW NOTHING

[Jokuc 8,172]

Jokuc, on 25 May 2013 - 03:30 AM, said:

4x^2+76x*4y-1508 = 12xy

To solve

4x²+76x*4y-1508 = 12xy

(I made up this equation myself actually)

 

You follow these steps, okay???

 

 

You first divide everything with 4

 

(4x²+76x*4y-1508 = 12xy) / 4

 

Which gives us edit actually it gives us 3xy but I typed shit wrong.

x ²+19 x *y-377 = 4xy

 

 

 

Then since we are only looking to solve x here, we won't need y in the equation. Therefore we divide with y

(x²+19x*y-377 = 4xy) / y

 

Which gives us

x²+19x-377 = 4x

 

 

Now by looking at the equation, I see that I can use the PQ forula to solve x if the equation equals 0.

 

Here's the PQ formula incase you don't know about it.

 

 

 

 

 

 

Since we need the equation to be equal to 0, I subtract 4x from both sides.

(x²+19x-377)-4x = (4x)-4x

 

Which gives us..

x²+16x-377 = 0

 

 

 

Now when we got x²+16x-377 = 0 it's all ready to use for the PQ forula.

Since the forula says -q at the end and we already got -q there, (-377)-(-377) takes out eachother, which means +377.

This gives us

 

x= -16/2 ± {sqrt}((16/2)²+377)

 

And then we will have to make sure to not forget the ± since the square root of AnyNumber² can be both positive and negative.

For example {sqrt}(64) can be both 8 since 8² = 64 and -8² = 64 since (-8)*(-8) takes out each other and becomes 8*8.

 

Anyways, we calculate what we can on the right side..

 

x= -8 ± {sqrt}(8²+377)

x= -8 ± {sqrt}(441)

 

Then take the square root out of 441...

x= -8 ± 21

 

Then we see that the first answer is -8+21 and the second answer is -8+21.

 

Therefore

x₁ = 13

 

x₂ = (-29)

 

 

 

 

4x²+76x*4y-1508 = 12xy

 

Now I am going to use x=13 became I am lazy and do not wish to use way too many negative numbers in here.

So x=13

 

4x²+76x*4y-1508 = 12xy

 

Now let put in our number here...

 

4*13²+(76*13)*4y-1508 = 12(13*y)

 

Then calculate what we can..

 

4*169+(988)*4y-1508 = 12(13*y)

 

676+988*4y-1508 = 12(13*y)

 

676+3952y-1508 = 12(13*y)

 

3952y = 12(13*y) + 832

 

3952y = 12(13*y) + 832

 

y(329+1/3) = 13y + 832

 

329y+1/3y = 13y + 832

 

329y+1/3y = 13y + 832

 

329y+1/3y - 13y = 13y + 832 - 13y

 

316y+1/3y = 832

 

(316y+1/3y)/(316y+1/3y) = 832/(316y+1/3y)

 

y = 832/(316y+1/3y) = 192/73

 

y = 192/73 (= 2.6301369863013699)

 

 

 

Now with this number we can calculate everything in here...

 

4x²+76x*4y-1508 = 12xy

x=13 y=192/73

 

Put in the numbers once again...

 

4*13²+(76*13)*(4*(192/73))-1508 = 12(13*(192/73))

 

4*169+(988)*(4*(192/73))-1508 = 12(13*(192/73))

 

676+988*(4*(192/73))-1508 = 12(13*(192/73))

 

676+988*(4*(192/73))-1508 = 12(13*(192/73))

 

NOW USE DAT SCIENTIFIC CALCULATOR!

 

676+988*(4*(192/73))-1508 = 9562.3013698630136986 ? 9562

 

12(13*(192/73)) = 410.3013698630136986 ? 410

 

And then

 

9562 = 410.....wait....

FUCK!

 

I did some step wrong or the equation was written incorrectly.

 

Looking at it now I can make the conclusion that...

 

4x²+76x*4y-1508 ? 12xy

 

 

 

 

This means me Twilight and Mah Jokuc spent a bunch of unnecessary time on this shit. Damnit.

 

 

 

 

 

---

 

...When I got math homeworks I don't want to do the shit, but when I got other homeworks, heck that's when I do the math!

 

 

 

tl;dr My equation was written incorrectly and I spent like more than an hour solving it when I got a bunch of other homeworks to do.

 

 

Did you understand? c:

Edited May 27, 2013 by Jokuc

[Unpredictable Ranger 696]

To put it in a better solution, simply do it like THIS:

 

Edited May 26, 2013 by Fluffle Puff

[Ashley 2,427]

To put it in a better solution, simply do it like THIS:

 

That girl is genius.

I have made an answer.

288.

[Azaxx 111]

Did you understand? c:

 Quite literally the best post I've seen on the forums yet xD

*shortened it so I didn't have to quote a massive complex load of super maths*

[Jokuc 8,172]

 Quite literally the best post I've seen on the forums yet xD

*shortened it so I didn't have to quote a massive complex load of super maths*

So I assume you have never seen any of my posts? Since they're all very boring super awesome and interesting+funny n shit.

Edited May 27, 2013 by Jokuc

[Shift 4,271]

@@Jokuc, 

Edited May 27, 2013 by Jolteon

[None42069 520]

Please Excuse My Dear Aunt Sally.

[Pinkazoid 3,493]

Oder of operations is as follows: PEMDAS

Parentheses

Exponents

Multiplication

Division

Addition

Subtraction

 

In that order

 

So...

 

(9+3)=12

2(12)= 24

48÷24=2

 

(48/2(9+3))=2

Wrong wrong wrong

 

It's 

P

E

M/D

A/S

 

 

You don't do it based exactly off of PEMDAS, if Division in the equation comes first, then you go with Division

 

Same thing for subtraction 

 

*reads pages*

 

*realizes is late for the thread*

 

WELL

 

DON'T MIND ME

Edited May 28, 2013 by Pinkazoid!

[TheBronyHeart 2,640]

Wrong wrong wrong

 

It's 

P

E

M/D

A/S

 

 

You don't do it based exactly off of PEMDAS, if Division in the equation comes first, then you go with Division

Same thing for subtraction 

 

*reads pages*

 

*realizes is late for the thread*

 

WELL

DON'T MIND ME

All I wish to say is that the way in which I stated is the way which is mandated by the New York State Regents curriculum. If it is wrong, I blame the state for forcing teachers to teach this way.

[Pinkazoid 3,493]

All I wish to say is that the way in which I stated is the way which is mandated by the New York State Regents curriculum. If it is wrong, I blame the state for forcing teachers to teach this way.

Well, now that i think about it, there is another way for the answer to be 2 and still be correct.

 

I dont remember the name of it but when you have a number outside of the parentheses it's multiplied with every number inside the parentheses, if i do it that way, it also results in 2 and is still correct, i forgot about that way x:

[TheBronyHeart 2,640]

Well, now that i think about it, there is another way for the answer to be 2 and still be correct.

 

I dont remember the name of it but when you have a number outside of the parentheses it's multiplied with every number inside the parentheses, if i do it that way, it also results in 2 and is still correct, i forgot about that way x:

distribution

[Jokuc 8,172]

Well, now that i think about it, there is another way for the answer to be 2 and still be correct.

 

I dont remember the name of it but when you have a number outside of the parentheses it's multiplied with every number inside the parentheses, if i do it that way, it also results in 2 and is still correct, i forgot about that way x:

distribution

 

Though 48/2(9+3) is still 48/2*(9+3)

 

you're thinking about

48/2(9+3)

2*9 + 2*3 = 24

Then 48/24

 

But remember that in 48/2(9+3) you still operate from left to and you can see that the division comes before the multiplication 48/2*(9+3).

 

Therefore you still solve the division first 48/2=24 and then you do the multiplication 24*9 + 24*3 = 288 (or just 24*12). Even if it says 2(9+3) and the 2 is in front of the parentheses. Everything inside the parentheses are the first priority as we all know, but the 2 is outside and does not count. Plus there's a hidden * in front of it. It's the mathematicians' way of saying

 

"We got 2(OF THESE)" instead for saying "We got (THESE) times 2" (2*(THESE))

It's just like when we put 7x instead of 7*x

 

y/x(z) = y/x*z = z(y/x) = z*(y/x)

Let's say we had 48*2/(9+3)

You just don't do the 2/12 first because the multiplication comes first.

 

ok I've said the same thing like 77 times now...

Edited May 28, 2013 by Jokuc

[Akemi Homura 7,680]

This sentence is a mess... math is supposed to be unambigious and must leave, without a doubt, there's only one answer.

[Pinkazoid 3,493]

Though 48/2(9+3) is still 48/2*(9+3)

 

you're thinking about

48/2(9+3)

2*9 + 2*3 = 24

Then 48/24

 

But remember that in 48/2(9+3) you still operate from left to and you can see that the division comes before the multiplication 48/2*(9+3).

 

Therefore you still solve the division first 48/2=24 and then you do the multiplication 24*9 + 24*3 = 288 (or just 24*12). Even if it says 2(9+3) and the 2 is in front of the parentheses. Everything inside the parentheses are the first priority as we all know, but the 2 is outside and does not count. Plus there's a hidden * in front of it. It's the mathematicians' way of saying

 

"We got 2(OF THESE)" instead for saying "We got (THESE) times 2" (2*(THESE))

It's just like when we put 7x instead of 7*x

 

y/x(z) = y/x*z = z(y/x) = z*(y/x)

Let's say we had 48*2/(9+3)

You just don't do the 2/12 first because the multiplication comes first.

 

ok I've said the same thing like 77 times now...

Though 48/2(9+3) is still 48/2*(9+3)

 

you're thinking about

48/2(9+3)

2*9 + 2*3 = 24

Then 48/24

 

But remember that in 48/2(9+3) you still operate from left to and you can see that the division comes before the multiplication 48/2*(9+3).

 

Therefore you still solve the division first 48/2=24 and then you do the multiplication 24*9 + 24*3 = 288 (or just 24*12). Even if it says 2(9+3) and the 2 is in front of the parentheses. Everything inside the parentheses are the first priority as we all know, but the 2 is outside and does not count. Plus there's a hidden * in front of it. It's the mathematicians' way of saying

 

"We got 2(OF THESE)" instead for saying "We got (THESE) times 2" (2*(THESE))

It's just like when we put 7x instead of 7*x

 

y/x(z) = y/x*z = z(y/x) = z*(y/x)

Let's say we had 48*2/(9+3)

You just don't do the 2/12 first because the multiplication comes first.

 

ok I've said the same thing like 77 times now...

I know, dumb butt, I was saying that too at first

 

If you use a scientific calculator the answer is 288 any other calculator says 2

[Shiki 5,853]

ARE YOU GUYS STILL FUCKING DISCUSSING THIS

WHY

[Ashley 2,427]

My calculator actually comes up with "System Error".

[Jokuc 8,172]

My calculator actually comes up with "System Error".

rofl

[Ashley 2,427]

ARE YOU GUYS STILL FUCKING DISCUSSING THIS

WHY

BECAUSE

THIS NEEDS TO BE DISCUSSED

Edited May 31, 2013 by Megamare