If you mean what I think you mean, then...
92
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Three ways of writing 81 with exponents are: 92, 34, and 32 X 32.You could also write it as 8.1 x101.
3 to the 4th power 9 squared
34, 811, 92
The exponents are added.
If you were to do -92, following the order of operations, exponents come before subtraction. Because of this -92 = -(92) which is -81. The quantity negative nine, squared, however is positive 81. In order to show that you want the entire quantity negative nine squared, you must use parenthesis (or brackets): (-9)2 = 81. This shows to do the "subtraction" first.