The answer is 144(I think it is probably the answer)
Answer: n=16
So basically you minus 4 by 16 so 16-4=12
12 times 3 equals 36. Hope this helps.
When we find the square root of a number we get 2 options, the positive and the negative one, for example:

Therefore, Ryan made an error in the last step because x is equal to 6 or x is equal to -6:
1/29 or 29/100 would be your awnser