Answer:
9x2y41
Explanation:
a^{ - n} = \frac{1}{a^{n} }
a−n=an1
(3xy^{2} )^{ - 2} = \frac{1}{(3xy^{2}) ^{2} }(3xy2)−2=(3xy2)21
= \frac{1}{3^{2}x^{2}(y^{2})^{2} }=32x2(y2)21
= \frac{1}{9x^{2}y^{4} }
=9x2y41
