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b) x2-8x+15
operamos:
(a³-4a²+6a)(3ab)
3a⁴b-12a³b+18a²b
ejercicio a) es falso
.............................
(-x+3)(-x+5)=x²-8x+15
operamos:
x²-5x-3x+15
x²-8x+15
ejercicio b) es verdadero