First simplify the square root:
Next, factor the numerator. There is a common factor of 2!
The factors of 2 divide out:
You might want to see my Lesson Plans in algebra.com or go to my website by clicking on my tutor name "rapaljer" anywhere in algebra.com. Look for the page called "MATH IN LIVING COLOR", and look for "Intermediate Algebra" then "Chapter 3 Radicals". If you want more challenging problems, look for "College Algebra", then "Chapter 1", where there is a lesson on Radicals.
Anyone who needs additional help with radicals can send me an Email and I may be able to direct you other pages on the website.