Answer: Use distributive property
Step-by-step explanation:
They are both correct it's just that the say it differently 8/4 IS 2 so yea. I'm a middle schooler.

get rid of -2 by subtracting it from 21

Now you get your answer

Hope this helps! :)
The question is saying a number is square, then squared again, and finally square again, making that number squared itself up to 3 times. So we take 6561 and we square root it 3 times. Square root of 6561 is 81, square of 81 is 9, and finally square root if 9 is 3. The final answer is 3.