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1. Algebraic Fractions

Should I move the left hand side to the right or shall I just leave it as it is and just cross multiply?
2. Re: Algebraic Fractions
(Original post by zed963)

Should I move the left hand side to the right or shall I just leave it as it is and just cross multiply?
The clue's in the question - solve this quadratic equation. Cross multiply then solve. Post what you get
Last edited by Plato's Trousers; 16-07-2012 at 20:21.
3. Re: Algebraic Fractions
[QUOTE=Plato's Trousers;38582635]The clue's in the question - solve this quadratic equati

4. Re: Algebraic Fractions
(Original post by Plato's Trousers)
The clue's in the question - solve this quadratic equation. Cross multiply then solve. Post what you get
Could you not do 5x-1/3 - 6/x =0
5. Re: Algebraic Fractions
[QUOTE=zed963;38582714]
(Original post by Plato's Trousers)
The clue's in the question - solve this quadratic equati

nope.

6. Re: Algebraic Fractions
[QUOTE=Plato's Trousers;38582748]
(Original post by zed963)

nope.

Why don't we move the 3x onto the right hand side?
7. Re: Algebraic Fractions
[QUOTE=zed963;38582775]
(Original post by Plato's Trousers)

Why don't we move the 3x onto the right hand side?
what 3x?

You are cross multiplying. So LHS bottom times RHS top and vice versa

ok?
8. Re: Algebraic Fractions
[QUOTE=Plato's Trousers;38582801]
(Original post by zed963)

what 3x?

You are cross multiplying. So LHS bottom times RHS top and vice versa

ok?
But the denominator is 3x so don't we move it to the right hand side.

I'm looking at this website tbh and thats what its telling me to do.

http://www.revisesmart.co.uk/maths/c...fractions.html
9. Re: Algebraic Fractions
[QUOTE=zed963;38582846]
(Original post by Plato's Trousers)

But the denominator is 3x so don't we move it to the right hand side.

I'm looking at this website tbh and thats what its telling me to do.

http://www.revisesmart.co.uk/maths/c...fractions.html
eh? That's not the question you posted. there is no 3x term in the question you posted.

right?
Last edited by Plato's Trousers; 16-07-2012 at 20:38.
10. Re: Algebraic Fractions
[QUOTE=Plato's Trousers;38582883]
(Original post by zed963)

eh? That's not the question you posted.
I know it isn't but its an example that I've been following, what method would you use then?

and what you do with the lowest common denominator in the fraction?
11. Re: Algebraic Fractions
[QUOTE=Plato's Trousers;38582883]
(Original post by zed963)

eh? That's not the question you posted. there is no 3x term in the question you posted.

right?

Yes that was the question
12. Re: Algebraic Fractions

You started off ok

But then

(6)(3) = (5x-1)(x)

and

13. Re: Algebraic Fractions
X = -9 or +2
14. Re: Algebraic Fractions
[QUOTE=zed963;38582913]
(Original post by Plato's Trousers)

I know it isn't but its an example that I've been following, what method would you use then?

and what you do with the lowest common denominator in the fraction?
you cross multiply as I have shown you. If you want to do it another way you can subtract the fractions,

but the first way is easier
Last edited by Plato's Trousers; 16-07-2012 at 20:43.
15. Re: Algebraic Fractions
(Original post by TenOfThem)

You started off ok

But then

(6)(3) = (5x-1)(x)

and

Oh right so in these type of questions you don't take the denominator to the right hand side then, you just cancel it off.
16. Re: Algebraic Fractions
(Original post by pseudonymegg)
X = -9 or +2
nope

x=-9/5 or 2
17. Re: Algebraic Fractions
(Original post by zed963)
Oh right so in these type of questions you don't take the denominator to the right hand side then, you just cancel it off.
I did multiply the RHS by 3x ... did you not see that?
18. Re: Algebraic Fractions
6/x = 5x-1/3

6(3) = x(5x-1)

18= 5x"2-x (-18)

0 = 5x"2-x-18

(5x+9) (x-2) = 0

x= -1.8 or 2
19. Re: Algebraic Fractions
(Original post by Plato's Trousers)
nope

x=-9/5 or 2
whoops i'm a bit rusty sorry I just re-posted the correct answer
20. Re: Algebraic Fractions
(Original post by zed963)
Oh right so in these type of questions you don't take the denominator to the right hand side then, you just cancel it off.
There is no "these types of questions"

the method is the same for all

multiply all elements by the common denominator ... then cancel appropriately

there are short cuts if you start to feel confident