the question states "write an irrational fraction that when rationalised the solution is 5. prove":confused: :eek:

please help me its really urgent

your help would be much appreciated

Printable View

- Mar 16th 2007, 06:29 PMminisurd help urgent
the question states "write an irrational fraction that when rationalised the solution is 5. prove":confused: :eek:

please help me its really urgent

your help would be much appreciated - Mar 17th 2007, 01:41 AMCaptainBlack
- Mar 17th 2007, 01:44 AMCaptainBlack
Don't make multiple posts of the same question, it confuses the system and wastes the helper time.

RonL - Mar 17th 2007, 01:40 PMmini
hi i think thats correct if it can be a surd over a surd can u explain how u got it

thanks - Mar 17th 2007, 01:55 PMCaptainBlack
Well I needed two surds one of which was 5 times the other, so anything

like 5 sqrt(n) and sqrt(n) will do, Now 5 sqrt(n) = sqrt(25 n), so now we

choose any n and sqrt(25 n)/sqrt(n) will do the trick, as long as n is not a

perfect square when the numerator and denominator will be integers -

which we do not want.

RonL - Mar 17th 2007, 05:43 PMmini
thanks for your help but square root125/ square root 5 is a rational number it has to be irrational

- Mar 18th 2007, 01:48 AMCaptainBlack
No it has to be rational when all reduced to lowest form, as it has to

be 5, which is an integer but may be written 5/1 so is rational.

What you want is for both the numerator and denominator to be irrational,

as sqrt(125) and sqrt(5) are.

(there is no irrational number equal to 5)

RonL - Mar 21st 2007, 02:48 PMmini
ok thanks for your help you might be able to help with my other question the heading is money and investment thnkyou heaps and heaps