4(5x – 3y) (x – 4y) – (3x – 4y) (2x +3y)
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4(5x – 3y) (x – 4y) – (3x – 4y) (2x +3y)
= 4 ( 5x² - 3xy - 20xy +12y²) - (6x² - 8xy + 9xy - 12y²)
= 4 ( 5x² -23xy +12y²) - (6x² +1xy - 12y²)
= 20x² -92xy + 48y² - 6x² - 1xy +12y²
= 20x² - 6x² -92xy - 1xy + 48y² + 12y²
= 14x² -93xy + 60y²
hope it helps..
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