How do you rationalize the denominator?
When you have a root (square root for example) in the denominator of a fraction you can "remove" it multiplying and dividing the fraction for the same quantity. The idea is to avoid an irrational number in the denominator.
you can remove the square root multiplying and dividing by
This operation does not change the value of your fraction because
Now you can multiply in the numerator and denominator:
Now a problem for you; what happens when the root is not alone???!!!
If you have:
You can use the same technique but...what do you use to multiply and divide?
HINT: look at what happens if you do this: