Here is a video on simplifying radical expressions where the presenter starts with simplifying simple square roots, and quickly develops into looking at more complicated problems. He covers simplifying a variable raised to a power under the radical sign, simplifying fractions within a square root, simplifying a radical by dividing, and rationalizing the denominator. Since this short video covers a number of topics rather quickly, it might serve as a good review for learners before an assessment, or as a review to previously learned material.