bagian i dan j gimana cara kerjanya kak??

i ) ( 3x-² • y⁴ / 9x³ • y² )-²

= 3-² x⁴ • y^-8
-------------------
9-² x^-6 • y-⁴

= 9² x⁴ x^6 y⁴
---------------------
3² y^8

= 81 x^10 y⁴
--------------------
9 y^8

= 9 x^10
--------------
y⁴


j) ( a-⁴ • b² • c / a • b^-6 • c³ )⁴

= a^-16 • b^8 • c^4
-----------------------------
a⁴ • b-²⁴ • c¹²

= b^8 b²⁴ c⁴
-----------------------------
a^16 a⁴ c¹²

= b³² c⁴
---------------------
a^20 c¹²

= b³²
--------------
a^20 c^8