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a. (x+3)(x-3)
b. (x+5y)(x-5y)
c. (x-1)2 al cuadrado
d. (x+8)2 al cuadrado
e. X(x-8)
f. -4x(x+4)
g. (x+7)(x+1) es aspa simple
h. (x-3)(x+2) es aspa simple