1. ## Rationalising denominator

Hi,
If i have : [attached image]

how do i obtain the other result?
Is it by rationalising denominator?
i thought that when you rationalise the denominator by multiplying it by
sqrt.k the numerator becomes: k.sqrt.k ?

Bit of confusion.
(The full question involves differentiating, however, my algebra skills have let me down :|)
thanks

NOTE: SORRY, that should be a 'k' inside the root sign, not 'x'.

2. Originally Posted by 99.95
Hi,
If i have : [attached image]

how do i obtain the other result?
Is it by rationalising denominator?
i thought that when you rationalise the denominator by multiplying it by
sqrt.k the numerator becomes: k.sqrt.k ?

Bit of confusion.
(The full question involves differentiating, however, my algebra skills have let me down :|)
thanks

NOTE: SORRY, that should be a 'k' inside the root sign, not 'x'.
Multiply numerator and denominator by sqrt(k). There will be a k you can cancel.

3. thank you, i'm an idiot -_-

4. $\displaystyle\frac{k}{2\sqrt{k}}=\frac{\sqrt{k}\sq rt{k}}{2\sqrt{k}}$