hi, i need to rationalise the denominator of this,

how would i work this out?

Printable View

- Jan 16th 2010, 03:26 AMandyboy179rationalising denominators
hi, i need to rationalise the denominator of this,

how would i work this out? - Jan 16th 2010, 03:54 AMpickslides
Here's one I prepared earlier.

Consider

Let's times it by 1 because that won't change anything

But 1 comes in many forms I.e

So lets make it the following

I did this because

Now we have

We have no radical in the denominator so we are finished.

Apply this method to your problem. - Jan 16th 2010, 04:00 AMandyboy179
- Jan 16th 2010, 04:09 AMpickslides
- Jan 16th 2010, 04:13 AMandyboy179
would the answer to my question be, Attachment 14842 ?

- Jan 16th 2010, 04:23 AMpickslides
Yes, yes it is

(Clapping) - Jan 16th 2010, 04:26 AMandyboy179
thank you so much, you'd make a great teacher!!!

- Jan 16th 2010, 04:30 AMandyboy179
oh ye one others thing, is this right? Attachment 14844

- Jan 16th 2010, 04:34 AMmr fantastic