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- MerlinLv 71 decade agoFavorite Answer
You multiply each portion in turn
4a^2b(3ab^2-4a+5b^2)
12a^3b^3 - 16a^3b + 20a^2b^3.........answer
- Anonymous1 decade ago
12a^3b^3 - 16a^3b + 20a^2b^3
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