Thread: rationalising denominators

hi, i need to rationalise the denominator of this,

how would i work this out?

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.

Originally Posted by pickslides

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.

but i don't understand how to get the answer

Originally Posted by andyboy179

but i don't understand how to get the answer

You have started the problem perfectly, now just follow what I have done in post #2.

Recall when multiplying fractions

Originally Posted by pickslides

You have started the problem perfectly, now just follow what I have done in post #2.

Recall when multiplying fractions

would the answer to my question be, ?

Yes, yes it is

thank you so much, you'd make a great teacher!!!

oh ye one others thing, is this right?

Originally Posted by andyboy179

oh ye one others thing, is this right?

Yes.