simplify 3x^3y(4x^3y^3+5x^2y+7x^3y)
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Step-by-step explanation:
= (3x + 2y) (4x + 3y) – (2x – y) (7x – 3y)
= 12x2 + 9xy + 8xy
= 12x2 + 9xy + 8xy + 6y2 – 14x2 + 6xy + 7xy – 3y2
= -2x2 + 3y2 + 30xy
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