( 2x + 3y ) ( x - 4y )
= 2x.x + 2x(-4y) + 3y.x + 3y(-4y)
= 2x² - 8xy + 3xy - 12y²
= 2x² - 5xy - 12y²( D. )
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( 2x + 3y ) ( x - 4y )
= 2x.x + 2x(-4y) + 3y.x + 3y(-4y)
= 2x² - 8xy + 3xy - 12y²
= 2x² - 5xy - 12y²( D. )