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(3а^2+1)(9a^4-6a^2+1)
(3a+1)(9a^2-6a+1)
(3a^2+1)(3a-1)

(3а²+1)(9а⁴- 6а²+1) = 27а⁶-18а⁴+3а²+9а⁴- 6а²+1= 27а⁶- 9а⁴- 3а²+1(3а+1)(9а²- 6а+1) = 27а³- 18а²+3а+9а²- 6а+1= 27а³- 9а² - 3а+1(3а²+1)(3а- 1) = 9а³- 3а²+3а -1