I'm doing a homework problem on the comp and I keep getting the same answer yet the computer says it's wrong. I checked my work and it works out fine, I don't understand what I am doing wrong.
``````
6x+1                    x-3
--------- +  9 =     -------
9                       4``````

I got -347/15 for x

Multiply everything by 9, then 4.
oh and btw, its mathS

I'm assuming the ---------- represent a division sign
(6x+1)/9+9 =(x-3)/4
multiply both sides x4 and x9

4*(6x+1)+9*4*9 =9*(x-3)
24X+4+324 = 9x-18
15X = -346
X = -346/15
my 1st rough attempt got me a -355/15
i did it in my mind tho
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Last edited by Aditya at Aug 29, 2008,
Quote by classical_gas
oh and btw, its mathS

don't start
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Quote by classical_gas
Multiply everything by 9, then 4.
oh and btw, its mathS

I'm assuming the ---------- represent a division sign

Aren't you supposed to find the LCD first, which is 36 and with that, cancel out the fractions?
I got x= -352/15
----
6x + 1 + 81 = 9/4 ( x-3)
24x + 328 = 9x - 27
15x = -355
x = -355/15 = 23 + 2/3

is what I got
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Quote by seljer
(6x+1)/9+9 =(x-3)/4
multiply both sides x4 and x9

4*(6x+1)+9*4*9 =9*(x-3)
24X+4+324 = 9x-18
15X = -346
X = -346/15

Nope, I just put your answer in and the computer says it's wrong
Last edited by Masamune at Aug 29, 2008,
Quote by seljer
(6x+1)/9+9 =(x-3)/4
multiply both sides x4 and x9

4*(6x+1)+9*4*9 =9*(x-3)
24X+4+324 = 9x-18
15X = -346
X = -346/15

9*3 = 27, not 18
Populus vult decipi. Decipiatur.

Quote by Mistress_Ibanez
It's can be a contraction and genitive case.

Quote by Mistress_Ibanez
If you cut down on these costs students won't learn so well, effecting the "quality"...
its an equal sign, you have to do the same operation on both sides.

x9 ===> 6x + 1 + 81 = 9/4x -27/4
now multiply by 4 and continue
Quote by FrenchyFungus
9*3 = 27, not 18

heh, engineering has made me suck at basic arithmetic

my lazy ass methods would mean "punch the thing into Mathematica" but its not installed on this computer

edit: I got myself a semesters worth of beer by doing people's homework in Mathematica
Last edited by seljer at Aug 29, 2008,
Quote by Masamune
Aren't you supposed to find the LCD first, which is 36 and with that, cancel out the fractions?

You could do that, or you can just mulitply by both numbers.
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Quote by FrenchyFungus
6x + 1 + 81 = 9/4 ( x-3)
24x + 328 = 9x - 27
15x = -355
x = -355/15 = 23 + 2/3

is what I got

This is right
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Yeah, just plugged x = -355/15 into the original equation, it works.
Populus vult decipi. Decipiatur.

Quote by Mistress_Ibanez
It's can be a contraction and genitive case.

Quote by Mistress_Ibanez
If you cut down on these costs students won't learn so well, effecting the "quality"...
arghhh I got another one that I am having some trouble in.

(3n+4)(n-5)-3n(n+4)=3

I don't really need any of you guys to do this one, I just need an explanation of how I multiply (3n+4) with (n-5)

I am so horrible at math
Quote by Masamune
arghhh I got another one that I am having some trouble in.

(3n+4)(n-5)-3n(n+4)=3

I don't really need any of you guys to do this one, I just need an explanation of how I multiply (3n+4) with (n-5)

I am so horrible at math

You use the FOIL method.
First: 3n and n
Outside: 3n and -5
Inside: 4 and n
Last 4 and -5
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^Yeah I'll just expand on that a wee bit though.

You have to multiply every term of the first bracket by every term of the second bracket.

So you have (3n + 4)(n - 5)

Then the outer terms: 3n*(-5) = (-15n)
Then the inner terms: 4*n = 4n
Finally the last term in each bracket: 4*(-5) = -20

Then just add the terms together to get n^2 - 11n - 20
Populus vult decipi. Decipiatur.

Quote by Mistress_Ibanez
It's can be a contraction and genitive case.

Quote by Mistress_Ibanez
If you cut down on these costs students won't learn so well, effecting the "quality"...
i forgot how to do math over summer. oh well i finished all my math for hs last year anyway. hehe
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