Workbook : pg. 6, q. 10

Why? 

Before doing this question in the textbook, I was confused on how to determine whether the answer was true or false. I was confused on what the function of the root (radical) sign was in these sorts of equations. I did the steps these way after Mrs Burton explained them in class. She explained how the radical sign is like a cousin to exponents.

Root (radical) sign :

The sign √ which indicates the square root of the number following (or a higher root indicated by a preceding superscript numeral).