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Press the square root button on your calculator.
There is probably no square root button on the laptop keyboard. Look around in the software on the computer for an application called " Calculator ". That will have a button on it to perform the square root operation, plus buttons for a lot of other operations too.
In scientific calculators there is usually a button you press. Less complex calculators don't have that button. It looks like this: `____ \/
You must be pressing the wrong button! Are you certain that you have pressed the square button and not just multiplied by 2? Try typing in -2 * -2 and see what result you get.
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.