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Answer:
16a^8 b^18 c^2
Step-by-step explanation:
(4a^4b^9c)^2
=> 4^2(a^4)^2(b^9)^2 x c^2
evaluate the power
16 (a^4)^2(b^9)^2 x c^2
16a^8 b^18 c^2