It isn't. The square of any real number is positive. (negative 9)2 = positive 81.
Did you mean negative (92) ? Well, 92 = 81, and the negative of that is negative 81.
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lokiya said: 9 squared is equal to 81
The square root of 81 is 9. 9 x 9 = 81.
When you square a number, you multiply it by itself. So, 9 squared means 9 multiplied by 9, which equals 81. In mathematical notation, 9 squared is written as 9^2 or 9 x 9.
The square root of 81 is 9. This is because 9*9 is 81. This also means that 81 is 9 squared or 92.
Negative 9 times 9= Negative 81