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Rx)= 7x^3( 5x^3 - 3) + 4(2x^6 - x^3)
= 35x^6 -21x^3 + 8x^6 -4x^3
= 43x^6 - 25x^3
Ahora lo que piden es la suma de los coeficientes:
Rx = 43 + (-25) = 18 respuesta
Salu2