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(5x+4y)X(3x-2y)= 5x(3x-2y)+4y(3x-2y)
=15x²-10xy+12yx-8y²
=15x²-10xy+12xy-8y²
=15x²+2xy-8y²
Es conveniente que realices todos los pasos para que no te confundas en un ejercicio
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