Answer:
-5
Explanation:
Hi! Our task is to determine the other number.
The square of 5 is 25. So, 5² = 25.
The square of another number is also 25. So, that number² = 25.
If that number's squared, it means that:
that number × that number = 25
But that number isn't 5 ! Then what is it? You guessed it ! It's -5. Only -5 could be the other number.