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#1
-n=2n+2

n=2/3

how the hell do i get there?
Brasil.

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#3
what?
Brasil.

Quote by Daneeka
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#5
Quote by alexdoabismo
-n=2n+2

n=2/3

how the hell do i get there?


-n=2n+2

-3n = 2
n = 2/-3 = -2/3
#7
start off by diving both sides by n
youd have -1= ....

you only have one n now and can solve for it easier
#9
Quote by Stormx
-n=2n+2

-3n = 2
n = 2/-3 = -2/3


thanks!!
Brasil.

Quote by Daneeka
I heard there is uranium gas in the tubes. So you could easily make a little nuclear blast. If i were you, i wouldn't want to start the World War III.




THE SHORT BACK AND SIDES !!!

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#10
Quote by Relativiti
start off by diving both sides by n
youd have -1= ....

you only have one n now and can solve for it easier


That's the stupidest way of solving it ever.
#11
n = 2/3 therefore -n= -2/3

-2/3 = 2n + 2

1 1/3 = 2n = 4/3

n=2/3
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#13
I must be out of school for too long because all I am getting is n=-2/3. sorry
#14
Quote by eckenrok
I must be out of school for too long because all I am getting is n=-2/3. sorry


That's the answer. Apparently OP (and a subsequent poster) suck and basic algebra manipulation. The OP claims he is 20 in his profile, heh
#15
Quote by Jay.R
n = 2/3 therefore -n= -2/3

-2/3 = 2n + 2

1 1/3 = 2n = 4/3

n=2/3


Let's check your answer

-n=2n+2
-(2/3) = 2(2/3) + 2
-2/3 = 4/3 + 2
-2/3 = 10/3

I don't think so. Don't solve equations in such a silly way.
#16
Quote by Stormx
That's the answer. Apparently OP (and a subsequent poster) suck and basic algebra manipulation. The OP claims he is 20 in his profile, heh

I get 2/3. as if you take -3n over you get n = 2/3, not 2/-3.
RIght? wrong? confused.
#17
math is retarded. im so glad im done high school.

...now im working towards a business degree...
#20
Quote by Sherlock_Bones
I get 2/3. as if you take -3n over you get n = 2/3, not 2/-3.
RIght? wrong? confused.


No you don't.

-n = 2n+2

Take away 2n from both sides

-n -2n = -3n
2n +2 - 2n = 2

so we're left with:

-3n = 2

Divide by -3

n = 2/-3 or -2/3

Quote by Patrick L
-n=2n+2
-n-2n=2n-2n+2
-3n/3=2/3
n=2/3


You've lost a sign in the last step. Remember you're dividing, not subtracting/adding.
#21
Quote by Sherlock_Bones
I get 2/3. as if you take -3n over you get n = 2/3, not 2/-3.
RIght? wrong? confused.

-3n=2

n=2/(-3)

n=-(2/3)
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Quote by element4433
Yeah. people, like Lemoninfluence, are hypocrites and should have all their opinions invalidated from here on out.
#22
Quote by Stormx
No you don't.

-n = 2n+2

Take away 2n from both sides

-n -2n = -3n
2n +2 - 2n = 2

so we're left with:

-3n = 2

Divide by -3

n = 2/-3 or -2/3


You've lost a sign in the last step. Remember you're dividing, not subtracting/adding.


i was being polite.
It is 2/3.
-3n=2 is right, but the next bit isn't, trust me, A-level maths student here.

EDIT: but i might fail, so don't trust me too much.
#23
Quote by Sherlock_Bones

i was being polite.
It is 2/3.
-3n=2 is right, but the next bit isn't, trust me, A-level maths student here.

so what's the next step?

ignore the positive/negative aspect of the equation?
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Quote by element4433
Yeah. people, like Lemoninfluence, are hypocrites and should have all their opinions invalidated from here on out.
#24
Quote by Sherlock_Bones

i was being polite.
It is 2/3.
-3n=2 is right, but the next bit isn't, trust me, A-level maths student here.


Well let's assume it is 2/3 and -3n = 2

So, we substitue 2/3 as n.

-3(2/3) = 2
-2*(3/3) = 2
-2 = 2

Which isn't true. I got As in maths and further maths.
#25
Quote by Stormx
Well let's assume it is 2/3 and -3n = 2

So, we substitue 2/3 as n.

-3(2/3) = 2
-2*(3/3) = 2
-2 = 2

Which isn't true. I got As in maths and further maths.


Sorry, you got "As" as a grade or you got one?
-3n=2.
(-3)n=2.
n=2(3, not -3
n=2/3.
I beleive anyway, could easily be wrong though.
#26
Quote by Sherlock_Bones
Sorry, you got "As" as a grade or you got one?
-3n=2.
(-3)n=2.
n=2(3, not -3
n=2/3.
I beleive anyway, could easily be wrong though.

you would have to divide by -3 or you'd still have the -n.

-3n is either (-3)*n or 3*(-n)

you can't just ignore that.
Rhythm in Jump. Dancing Close to You.

Quote by element4433
Yeah. people, like Lemoninfluence, are hypocrites and should have all their opinions invalidated from here on out.
#28
Quote by Sherlock_Bones
Sorry, you got "As" as a grade or you got one?
-3n=2.
(-3)n=2.
n=2(3, not -3
n=2/3.
I beleive anyway, could easily be wrong though.


It's the plural of "a", I was just too lazy to put it in quotes. Anyone with half a brain would realise that, but then I'm not expecting much from someone who thinks 2/3 satisfies this equation.

-n=2n+2

Lets do it, mutha****a

-(2/3) = 2(2/3) + 2
-2/3 = 4/3 + 2

Even now you should realise you're wrong, but incase you're in any doubt:

-2/3 = 4/3 + 6/3
-2/3 = 10/3

This is NOT an equation. n=2/3 is NOT a solution. Get the **** of UG and learn basic algebra if you expect to get anything but a U in maths. Maybe then you can parade it infront of me.
#30
Quote by Stormx
It's the plural of "a", I was just too lazy to put it in quotes. Anyone with half a brain would realise that, but then I'm not expecting much from someone who thinks 2/3 satisfies this equation.

-n=2n+2

Lets do it, mutha****a

-(2/3) = 2(2/3) + 2
-2/3 = 4/3 + 2

Even now you should realise you're wrong, but incase you're in any doubt:

-2/3 = 4/3 + 6/3
-2/3 = 10/3

This is NOT an equation. n=2/3 is NOT a solution. Get the **** of UG and learn basic algebra if you expect to get anything but a U in maths. Maybe then you can parade it infront of me.


Chill dude, i think cranky needs a bit of sleep, but kudos on the maths i suppose, gees
EDIT: to the guy below, serious, kick a man when he's down. Cut me some slack here, its 12:15, im pretty tired, and you lot are like a pack of jeckels. Just CHILL out. Please?
Last edited by Sherlock_Bones at Nov 7, 2009,
#31
it's -2/3! for god's sake quit arguing that its 2/3 when you've been proved wrong
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#32
I'm pretty sure 12 year-olds could easily solve this.
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#33
Quote by Sherlock_Bones
Chill dude, i think cranky needs a bit of sleep, but kudos on the maths i suppose, gees
EDIT: to the guy below, serious, kick a man when he's down. Cut me some slack here, its 12:15, im pretty tired, and you lot are like a pack of jeckels. Just CHILL out. Please?

to be fair, you started it.
Rhythm in Jump. Dancing Close to You.

Quote by element4433
Yeah. people, like Lemoninfluence, are hypocrites and should have all their opinions invalidated from here on out.
#34
Quote by Sherlock_Bones
Chill dude, i think cranky needs a bit of sleep, but kudos on the maths i suppose, gees


Gracious in defeat, aren't we? It's as if now that you've been proven to be of no use whatsoever, you can forgive me for proving you wrong. Get your nose in a book sonny. If you can't handle regular algebra, i've no idea how you're going to deal with matrices and complex planes.
#35
Quote by Lemoninfluence
to be fair, you started it.


And you finished it, fair enough.
Just lock this thread, hide my shame forever; and everyone else...well, keep being jerks i guess.
#36
So I took a stab at the equation and i'm pretty sure it's n= -2/3

-n=2n+2 subtract 2n from both sides
-3n=2 divide both sides by -3
n= -2/3

now the important part...
-(-2/3)=2(-2/3)+2
2/3= -(4/3)+2
2/3= -(4/3)+6/3
2/3=2/3 all from a kid with a B in pre-calc
#37
Quote by alexdoabismo
-n=2n+2

n=2/3

how the hell do i get there?

-n=2n+2
-n-2n=2
-3n=2
-3n/-3=2/-3
n=-2/3

cause n is -n in this equation, the -2/3 gets cancelled into 2/3.

2/3 is wrong.
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#38
...I forgot maths was ever this easy.

And that some people still manage to get it wrong.
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#40
Dear god, this is like 9th grade algebra, I can't believe people are having so much trouble

-n = 2n + 2

Move the (-n) to the right side:

(-n) + n = 2n + n + 2
0 = 3n + 2

Isolate n by moving the 2 to the left side:

0 - 2 = 3n + 2 - 2
-2 = 3n

Divide both sides by 3:

-2 / 3 = 3n / 3

-2/3 = n

Problem solved.

edit: and if you really want to be sure, perform a LS/RS check

LHS = -n
= - (-2/3)
= 2/3

RHS = 2n + 2
= 2(-2/3) + 2
= -4/3 + 2
= -4/3 + 6/3
= 2/3

LHS = RHS
Last edited by joemama9119 at Nov 7, 2009,
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