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= (3a - 1)×(3a - 1)×(3a - 1)
= (9a² - 3a - 3a + 1)×(3a-1)
= (9a² - 6a + 1)×(3a-1)
= 27a³-9a²-18a² +6a + 3a-1
= 27a³ - 27a² + 9a -1
(3a-1)^3=(3a)^3-3(3a)^2*1+3a*1^2-(1)^3=27a^3-27a^2+9a-1