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M =
MULTIPLICAMOS POR 9:
9M = a³ + 3a² - 18a
FACTORIZAMOS "a":
9M = a(a² + 3a - 18)
FACTORIZAMOS: (a² + 3a - 18)
a + 6
a - 3
LUEGO:
9M = a (a + 6)(a - 3)
M = (a/9) (a + 6)(a - 3)
ESO ES TODO, SALUDOS.............