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(x² - 9y²) - (3x - 9y)
= [x² - (3y)²] - 3(x - 3y)
= [(x + 3y)(x - 3y)] - 3(x - 3y)
= [(x + 3y) - 3](x - 3y)
= (x + 3y - 3)(x - 3y)
.·. (x² - 9y²) - (3x - 9y) = (x + 3y - 3)(x - 3y)
Luego uno de sus factores es: (x + 3y - 3)
factorizando
(x-3y)(x+3y) -3(x-3y)