Cual es el producto de (3x-2y)(3x+2y)

9x2 + 6yx - 6xy + 4y

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Primero se multiplica el primer termino del primer paréntesis por los dos terminos de el segundo paréntesis, después haces lo mismo con el segundo termino y finalmente reduces la ecuación:

9x^2 +6xy -6xy -4y^2=

9x^2 - 4y^2

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