A radical expression can be entered into the worksheet in two different ways: by entering a whole new expression, or by making a selected expression the argument of the root.
Using the "New root" button
When you click on the 
(New root) button it produces a root template 
, so that you can fill in both the radicand and the radical index. First enter the radicand, and then either click on the radical index space-holder 
or use the 
key to move ‘up’ and enter the radical index.
Using the "Selected radicand" button
This method is typically used when the radicand is already entered, i.e. you have entered 2x+3 and now you want to make it into a radicand. Highlight it with the mouse and click on the 
(Selected radicand) button. You will then be able to enter the radical index.
How do you "exit" the root?
For example, if the cursor is at the end of a radicand and you need to add another expression to the existing one, simply press the 
key – the cursor’s size will tell you what your exact position within the expression is - and enter the next expression once the cursor 'is clear' of the radicand.
Watch Video
Simplifying radical expressions
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