The square of 15 is 225. The square of what other number is 225?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The square of 15 is 225. The square of what other number is 225?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-15
The square of 15 is 225. The square of what other number is 225?
train