The blanks in the expression are
base number = 81
exponent for x = -2
exponent for y = 0
How to solve the expression
The expression if solved using exponential laws
The laws are applied as follows
= (3x-³y-⁹ * 3x²y⁹)²
= (9 * x⁻³⁺² * y⁻⁹⁺³)²
= (9 * x⁻¹)²
= 81 x⁻²