Answer:
-4a^4b^2 + 9a^2b -12b^3.
Explanation:
(2a^2b-5b^3+4a^4b^2)-(7b^3+8a^4b^2-7a^2b)
= 2a^2b-5b^3+4a^4b^2-7b^3-8a^4b^2+7a^2b
= -4a^4b^2 + 9a^2b -12b^3.
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