The 11-minute video above is a long explanation of square roots and radicals. She starts by reviewing how to square a number. If you want to skip that part, start the video at 3:00.
This video demonstrates how to simplify square roots
Did you know?
Radicals (roots) are the inverse of exponents. For example, to "undo" a square, you take the square root.
= 4 and √4 = 2