Answer:
-b^5.
Explanation:
(2a^5b^3)^4 / (-16a^20b^7)
= 2^4 a^(5*4) b^(3*4) / -16a^20 b^7
= 16a^20 b^12 / - 16 a^20 b^7
= b^12 / -b^7
= -b^(12-7)
= -b^5.
(2a⁵b³)⁴/(-16a²⁰b⁷)=
= (16a²⁰b¹²)/(-16a²⁰b⁷)
= - b¹²/b⁷
= - b⁵
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