/sci/ - Science & Math

Ran out of fingers. Impossible.

/b/ pwned this. Only the summerfags couldn't do it. x= -31

>>1423918
x=-55

<span class="math"> x = niggers [/spoiler]

/b/ is getting confused on the order of operations.

3-6*7+12=x+4
you do multiplication first
3-42+12=x+4
then you do addition
3-54=x+4
then subtraction
-51=x+4
subtract 4 from each side
-55=x

-6*7 = -42
+ 12 = -30
+ 3 = -27
- 27 - 4 = -31

x = -31

3 - 6*7 + 12 = x + 4

3 - 6*7 + 12 - 4 = x

3 - 42 + 12 - 4 = x

-39 + 12 - 4 = x

-27 - 4 = x

x = -31

YEY that's how simple it is

>>1423941
lol at -42 + 12 = -54

X=-31

PEMDAS motherfuckers, do you speak it?

Though the proper parenthesis would help.

i are /b/tard i are speak like dis so u are comfortable with me and think i am /b/tard. x equals -31

>>1423941

subtraction and addition weigh equally, you do them from left to right

3-6*7+12=x+4
3-42+12=x+4
3-54=x+4
-51=x+4
-55=x

x=-55

parentheses, exponent, multiplication, division, addition, subtraction. In that order. PEMDAS

>>1423957
No

>>1423957
what the fuck are you on about

>>1423951
Parenthesis are not required.

>>1423957
No that's wrong- addition and subtraction happen at the same time. It's -31. This is a stupid question anyway since it just tests everyone's knowledge of mathematical conventions.

3-42+12=x+4
-51=x+4
x=-55

wait, is pemdas like this- P, E, [M,D],[A,S]

such that when you do multiplication and division you go from left to right, not just doing multiplication first?

Algebra calculator says -31. http://www.algebrahelp.com/calculators/equation/calc.do?equation=3-6*7%2B12%3Dp%2B4&solvf=p

>>1423976
yes- but since division is normally written as fractions you don't normally need to worry about this rule.

>>1423972
op is, as always, a faggot

in this case a dumb faggot

>>1423976
yep. It might change relative to region, though. It's like that in the States.

>>1423947
Because it's really -1(42 + 12) since you do addition first.

-1(42 +12)
-1(54)
-54

or it could be

-1(42 +12)
distributed
-1*42 + -1*12
-42 -12
-54

Math is a very fluid science.

>>1423996
No, you don't. and if it were distributed there would be parentheses in this expression

>>1423964

Yes they are, because without the proper parenthesis both answers are correct. The parenthesis help to define the problem.

For the hope of all human kind I hope everyone who's not saying -31 is trollin'.

>>1424009

>>1424005
No, they're not, because there are well-defined mathematical conventions that allow you to evaluate expressions like this without parentheses. Doing the operations in the correct order gives the (only) correct answer, x = -31

>>1424005
You don't need parentheses though. We know the order is multiplication, addition, subtraction in this problem. It's a very basic problem that's probably been contrived just to point this out.

I thought parantesis guy was right?
3 - 6 = -3
-3 * 7 = -21
-21 + 12 = -9
-9 - -4 = -13

Why not do it left to right?

once again, sci manages to be annoying

"These mnemonics may be misleading, especially if the user is not aware that multiplication and division are of equal precedence, as are addition and subtraction."

from wikipedia

-23

LEARN 2 PEMDAS TIERS

>>1424005
You be trollin'
If not you are a moron. There is still only 1 answer.

>>1424030
Multiplication and division always happen before addition and subtraction. So, no.

>>1424034
I wouldn't trust Wikipedia though. It's not peer-reviewed. And it could be influenced by metric math.

>>1424049
Lmao, metric math.

>>1424033
This, and nothing else.

inb4 200 other morons insist that addition and subtraction (or multiplication and division) are in any way different

3 - 6 * 7 + 12 = X + 4
3 - 42 + 12 = X + 4
3 + (-42) + 12 = X + 4
3 + (-42) + 12 + (-4) = X

Now it's all addition, so go fuck yourselves.

>>1424049
Metric maths guys! Hit the decks!

-31

I must be a God, did it all in my head.

-31 you asses

This is one of the few threads that got better when the answers got shorter

>>1424061
3 + (-42) + 12 + (-4) = X

-39 + 12 + (-4) = X

-27 + (-4) = X

-25 = X

What?

How is this different from when I get -55? if it's the same problem, shouldn't there only be one solution?

>>1424083
you should have gotten -31. -27 -4 = -31

>>1423918
you sir are a moron.
YOU MUST USE FUCKING PARENTHESIS HOLY SHIT.

>>1424083
There can be more than one solution depending on the steps you take to solve it. Math is a very fluid science.

Anyone who can't do this in his head and doesn't get -31 is fucking retarded and should seriously get the fuck out of /sci/.

ITT: People think additiion always comes before subtraction, and other people deny that mathematical conventions even exist.

>>1424093
0/10
STOP THAT HORRIBLE TROLLING RIGHT NOW

ITT: liberal arts/social science majors failing hard at basic algebra

GLORIOUS HARD SCIENCE/ENGINEER MASTER RACE

>>1424095
This.
Then again, I feel like I'm being trolled. I hope you guys are not that retarded.

>>1424090
OK, fine.

3 - (6*7) + 12 = X +4

You happy? With the possible exception of some trolls, I think we all already knew where the parentheses would be anyways.

ITT: People who didn't learn PEMDAS.

X = 3 - 6 * 7 + 12 + (-4)

X = -12/1

x = 1 (mod 2)

6*7=42
42+12=54
3-54=-51
now the other side
4+-4 = 0
now the first side again
51-4=47

>>1424113
BEDMAS motherfucker

3 - 6* 7 + 12 = x + 4
3 - 42 + 12 = x + 4

3 - 46 + 12 = x
-45 + 15 = x
-30 = x

Happy?

>>1424131
>>1424113
What is the difference between PEMDAS and BEDMAS?

ITT I lose hope for humanity because of trolls and retards

-31

>>1424133
your -46 turned into a -45

>>1424139
BEDMAS is metric. Notice how they do division before multiplication.

>>1424142

if you're losing it purely based on this thread, you're either new or you haven't wandered through >>>/new/

3-42+12=x+4
15=x+46
15-46=x
x=-31

>>1424139
BEDMAS: Brackets Exponents Divide Multiply Addition Subtract

PEMDAS: Parentheses, Exponents, Multiply, Divide, Add, Subtract

Same shit really, just some schools use one acronym over the other.

>>1424133
3 - 46 = -45

>>1424173
That wasn't the poster's mistake- note how he added the 12 and the 3 to get 15. The mistake was that the -46 magically turned into a -45.

>>1424173

>>1424163
I generally avoid /new/, I was
>implying
that /sci/ should do better than this

>>1424172
Who uses brackets in math? The French?
[3-6]*[7+12] = X + [4]
[-3]*[19] = X +4
-57 = X + 4
-61 = X

See, brackets just give you a completely different answer? How does the world work like this?

<div class="math">3 - 48 + 12 = x + 4</div>
<div class="math">3 - 48 + 12 = x + 4</div>
<div class="math">-45 + 12 = x + 4</div>
<div class="math">-33 = x + 4</div>
<div class="math">-37 = x</div>

>>1424194

>/sci/ can do better than this

you ARE new here. give up this notion quick, or you'll be slitting your wrists by next tuesday

this is a 5th grade question, why are you guys even posting in this thread.... oh yah its summer, and a Saturday.

>>1424202
Math is a very fluid science.

>>1424163
>if you're losing it purely based on this thread, you're either new or you haven't wandered through >>>/new/
>I'm a self hating white liberal pansy and people who disagree with me make me angry

>>1424206
I've been on /sci/ from the beginning, I'm just an optimist (I don't even know why I would think this anymore)

>>1424198
I'm assuming that what they call "brackets" must be what we call "parentheses."

>>1424198
it works if you put the brackets in the right spots
3-[6*7]+12 = X + 4
3-42+12=x+4
-27=x+4
-31 = X

>>1424217
Brackets [ ]
parentheses ( )

>>1423996
it truly is, now go learn it.

>>1424227
actually they are synonyms.

also gtfo

This one, I don't even understand.

>>1424211

lol, never change :3

>>1424246
your a troll but 6*7=42

>>1424247
>I blame all of my problems on white people

>>1424260

seeing as how most of my problems stem from my own mistakes, yeah, i gotta blame white people. you got something against self-accountability?

>>1424240
I don't know. I kinda like it over here. I think I'll stay.

>>1423926

should have been /thread

>>1424269
Fine. Maybe you'll learn something about metric math.

>>1424268
>pretend to be white
>BAWW about wacism on /new/
>blame all of your problems on white people

>>1424215
the beginning was a few months ago brobaloney, come down of your thrown.

>>1424281
Metric Math = Math

>>1424288
>down of your thrown.

>>1424288
I'm not on a throne, just saying I'm not new to /sci/

>>1424285

i wouldn't be caught dead wearing an ecko cap, so i don't see how your post applies to me

>>1424291
Even BODMAS?

Here's a quick refresher course for those who seem to have forgotten order of operations:

http://khanexercises.appspot.com/video?v=ClYdw4d4OmA

>>1424302
Mnemonics are often used to help students remember the rules, but the rules taught by the use of acronyms can be misleading. In the United States, the acronym PEMDAS or "Please Excuse My Dear Aunt Sally" is common. It stands for Parentheses, Exponentiation, Multiplication, Division, Addition, Subtraction. In other English speaking countries, Parentheses may be called Brackets, and Exponentiation may be called either Indices, Powers or Orders, and since multiplication and division are of equal precedence, M and D are often interchanged, leading to such acronyms as BEDMAS, BIDMAS, BIMDAS, BODMAS, BOMDAS and BPODMAS.

from wikipedia

inb4

3 - 6*7 + 12 = -118 + 4
3 - 42 +12 = -114

>>1424316
I already said that here:
>>1424034

>>1424356
Yes, and it was already pointed out that we shouldn't trust wikipedia because of their metric math.

-55

31

-42+12=-55

x = -31

Not hard

>105 posts and 11 image replies omitted. Click Reply to view.
I seriously hope you guys are just trolling.

P
E
MD
AS
LEFT TO RIGHT

NOT HARD