4a× (2a³b²- 3ab² +5a) +4b× (6a²b-2ab² +3y) solve
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4a× (2a³b²- 3ab² +5a) +4b× (6a²b-2ab² +3y)
=>(4a×2a³b²- 4a×3ab² +4a× 5a )+(4b×6a²b-4b×2ab² +4b×3y)
=>(8a^4b² - 12a²b³ + 20a²) + (12a²b² - 8ab³ + 12by)
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