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= (3a²-2a)².(3a²-2a)
= ((3a²)²+2.3a².(-2a)+(-2a)²).(3a²-2a)
= (9a^4 - 12a^3 + 4a²).(3a²-2a)
= 9a^4 .3a² + (-12a^3).3a² + 4a².3a² +
9a^4 . (-2a) + (-12a^3).(-2a) +
4a².(+2a)
= 27a^6 - 36a^5 + 12a^4 - 18a^5 +
24a^4 + 8a^3
= 27a^6 - 54a^5 + 36a^4 + 8a^3