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√3 Use the check mark. Alt or Option v on a Mac
To use the root button on a scientific calculator, first type the number you want to find the root of. Then, press the root button, which is usually denoted by a √ symbol. Finally, enter the index of the root, such as 2 for a square root or 3 for a cube root, and press equals (=) to get the result.
I cant use the square root symbol so lets use the word "root" to represent square root. The answer would be 4root2
-13 or +13 are both square root of 169, but we often use the positive square root, 13, as the principal square root.
Use a calculator.