Respuesta :
Greetings from Brasil...
From potentiation properties:
Mᵃ ÷ Mᵇ = Mᵃ⁻ᵇ
division of power of the same base: I repeat the base and subtract the exponents
In our case
3² ÷ 3⁴
3²⁻⁴
3⁻²
We also know about another property: P⁻ⁿ = (1/Pⁿ) so
3⁻² = 1/3²