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b) ( 6x - 12y) × ( 36xy³)
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( 18x²y ) × ( 12x - 18y)

= 6 ( x - 2y ) × ( 18xy)(2y²)
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( 18xy )( x ) × 6 ( 2x - 3y )

= ( x - 2y) × ( 2y²)
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( x ) × ( 2x - 3y)

= 2xy² - 4y³
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2x² - 3xy