Hello!
The answer is: 12.
Why?
Squaring means elevating the number by two, it means that the number will be mulitplied by itself two times. On the opposite, the square root of a number is the number that squared or elevated by two gives as result that number.
We must remember that:
and,
Then, the square root of 12 square is:
Hence, the square root of 12 squared, is 12.
Have a nice day!