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b. (3x-y)(2x+3y) = 6x^ + 7xy - 3y^
c. (2x+3y)(3x-2y) = 6x^ + 5xy + 6y^
d. (3x-4y)(x-2y) = 3x^ - 10xy + 8y^
^ = kuadrat
no. 3 sm 4 agak bingung maaf klo salah..