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Old 11-11-2008: 11th November 2008 12:46 #1 
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Default GCSE Math Help!
 
It's to do with rearranging algebraic fractions..I'm finding this particular one difficult at the moment..
Would some kind soul please help me, and explain how to do it?
My revision guide isn't really helping matters.

Really sorry but I can't use that maths symbol TSR thing either :| So if someone could re-express this problem with the symbols that would be appreciated also so that it makes more sense!

2x/5 - 4x+5/3 = x+8

lmao I realise how retarded that probably looks! :P
 

Last edited by Jizzabelle : 11-11-2008 at 12:49.

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Old 11-11-2008: 11th November 2008 12:55 #2 
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Default Re: GCSE Math Help!
 
Originally Posted by Jizzabelle
2x/5 - 4x+5/3 = x+8

\frac{2x}{5}-\frac{4x+5}{3}=x+8

Is that what you mean?

LaTeX is easy by the way. Just quote me to see what I did.

As for the question. I would multiply both sides of the equation by the lowest common mupltiple of 3 and 5 for a start and I'll point out that \frac{2x}{5}\times 15 \neq \frac{30x}{75}

Last edited by rnd : 11-11-2008 at 12:58.

Old 11-11-2008: 11th November 2008 12:56 #3 
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Default Re: GCSE Math Help!
 
First get rid of the annoying denominators by first multiplying the equation through by 5, and then multiplying it through by 3.
 
Old 11-11-2008: 11th November 2008 13:10 #4 
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Default Re: GCSE Math Help!
 
Thanks for your help guys, but I still don't get it . On first glance, I thought I had to..
Originally Posted by Kolya
First get rid of the annoying denominators by first multiplying the equation through by 5, and then multiplying it through by 3.

but, it didn't work out .

2x - 4x+ 5 = 15x +120 ?
= -2x + 5 = 15x + 120 ?
moved the + 5 across
- 2x = 15x + 115
moved the 15x across..
-17x=115

I've really messed it up and I'm so confuuuused.
 
Old 11-11-2008: 11th November 2008 13:17 #5 
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Default Re: GCSE Math Help!
 
Your first line is wrong. Multiplying through by 5 gives 2x - \frac{20x + 25}{3} = 5x + 40, and then multiplying through by 3 gives 6x - 20x - 25 = 15x + 120 (I think!)
Old 11-11-2008: 11th November 2008 13:25 #6 
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Default Re: GCSE Math Help!
 
Originally Posted by Kolya
Your first line is wrong. Multiplying through by 5 gives 2x - \frac{20x + 25}{3} = 5x + 40, and then multiplying through by 3 gives 6x - 20x - 25 = 15x + 120 (I think!)

Aye, I tried that way aswell, but it doesn't seem to work either :\
 
Old 11-11-2008: 11th November 2008 13:26 #7 
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Default Re: GCSE Math Help!
 
It does. Try again.
Old 11-11-2008: 11th November 2008 19:25 #8 
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Default Re: GCSE Math Help!
 
-14x-25=15x+120
-145=29x
 
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