Multiply: a3–4ab and 2a2b.
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( a3–4ab) ( 2a2b )
→ a×3 -4×a×b×2×a×2×b
→ a×(-1)×a×b×2×a×2×b
→{(-1×2×2)×(a×a×a×b×b)}
→ (-4 )× (a³b²)
→ -4a³b²
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