This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

Typing Square Roots

Typing

To get a square root sign, press the Control key and the 2 key at the same time.
Press Ctrl+2 or Ctrl+@.
Click for copyable input
Type inside the placeholder (which is already selected).
Type .
Click for copyable input
Press the Control key and the Space bar at the same time to get out of the square root.
Press Ctrl+Space.
Click for copyable input

Typing

To get a square root sign, press the Control key and the 2 key at the same time.
Press Ctrl+2 or Ctrl+@.
Click for copyable input
Type inside the placeholder (which is already selected).
Type .
Click for copyable input
Press the Control key and the Space bar at the same time to get out of the square root.
Press Ctrl+Space.
Click for copyable input
Type the second square root in the same way as the first.
Press Ctrl+@, type , and press Ctrl+Space.
Click for copyable input

Typing

To get a square root sign, press the Control key and the 2 key at the same time.
Press Ctrl+2 or Ctrl+@.
Click for copyable input
Type inside the placeholder (which is already selected).
Type .
Click for copyable input
Press the Control key and the Space bar at the same time to get out of the square root.
Press Ctrl+Space.
Click for copyable input

Another Way of Typing

Start by typing the expression that will be inside the square root.
Type .
Click for copyable input
Select the expression. (You can select by dragging, by pressing Ctrl+. repeatedly, or by clicking the expression repeatedly.)
Select .
Click for copyable input
Press the Control key and the @ key at the same time to put a square root around the selection.
Press Ctrl+@.
Click for copyable input
Get out of the square root by pressing the Control key and the Space bar at the same time.
Press Ctrl+Space.
Click for copyable input