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When a number is squared, it has been multiplied by itself. For instance: 4 squared means 4x4, which is equal to 16.
If you square a number, then you are taking the number times itself. For instance, 4 squared is 16, because 4 times 4 is 16.
The next number in the series 2-4-3-9-4 is 16. 2 squared is 4, 3 squared is 9, 4 squared is 16
3 squared is 9 and 4 squared is 16, so the square root of any whole number between 9 and 16 will be irrational.
The answer is 4 squared minus 2 squared as 4 squared is 16 minus 2 squared, which is 4, gives you 12 as an answer.