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Home » Mathematics » Let the polynomials A = 7x² + 3xy and B = - 3xy. Determine A. B (multiplication) a) - 21x 2 - 9xy b) 21x 2 + 9xy c) - 7x 2 - 3xy d) 7x 3 + 3x 2 y 2 e) - 21x 3 y - 9x 2 y 2